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H A A - - A group of six halo acetic acids regulated in drinking water (mono, di and tri-chloroacetic acid, mono and di bromoacetic acid and chlorobromoacetic acid). D 6161, D habitable space---occupiable space normally used for living, includ- ing such activities as sleeping, eating, and cooking. E 631, E habitable space--See building space. E 631, E habitat, n--the place where a population of organisms lives and their surroundings, both living and non-living. E 2114, E habitat indicator, n - - a physical attribute of the environment mea- sured to characterize conditions necessary to support an organism, population, or community. E 2114, E habit plane---crystallographic plane in a parent phase along which a new phase (or phases) is (are) generated. E 7, E hackle--a finely structured fracture surface marking giving a matte or roughened appearance to the surface, having varying degrees of coarseness. Finely structured hackle is variously known as fine hackle, frosted area, gray area, matte, mist, and stippled area. Coarsely structured hackle is also known as striation. C 162, C hackle marks--fine ridges on the fracture surface of the glass, parallel to the direction of propagation of the fracture. C 162, C hackling, n--in flax, the process of cleaning and aligning long-line fibers to improve fineness and remove non-fibrous materials and short fibers. D 123, D hackling, v--in flax, the process of cleaning and aligning long-line fibers to improve fineness and remove non-fibrous materials and short fibers. D 6798, D hair, n--natural animal fiber other than sheep's wool or silk. D 123, D hair, n--natural animal fiber other than sheep's wool or silk. D 4845, D hair, n--wire protruding from the perimeter of a tire chip or shred. (See also fishhooks). D 5681, D hairiness, n--of yarns, an overall condition characterized by fila- ments or fibers protruding from the yarn surface and uniformly distributed along the yarn length. (Compare wild fibers.) D 123, D hairiness, n--or yarns, an overall condition characterized by fila- ments or fibers protruding from the yam surface and uniformly distributed along the yam length. (Compare wild fibers.) D 4849, D hairline crack--in protectivecoatings, a very fine crack (having a hairlike appearance) that is visible on the surface of a dried coating film. D 4538, D hairline or hairlining--a defect manifested in finished ware as a line or system of lines in a strain pattern, having the appearance of cracks healed by fusion. C 286, B hair-on leather leather tanned without removing the hair from the skins or hide. D 1517, D hairy--See fuzzy. D 3990, D halation, n--(1) the apparent increase in size of a primary or secondary light source due to scattering of light toward the observer, the surround being significantly darker than the light source. ( 2 ) in retroreflection, the apparent increase in size of a retroreflector, viewed by directional illumination (for example, automobile headlights) in a dark surround. E 284, El halation--the scattering of light by the transparency into the viewer's line-of-sight reducing the perceived contrast of external objects, also referred to as haze. F 2429, F half bath--a room containing a lavatory (wash basin) and a toilet (water closet). E 631, E half bath--See building space. E 631, E half-car roughness index (HRI), n - - a n index resulting from a mathematical simulation of vehicular response to the longitudinal profile of a pavement using the half-car simulation model de-
H
scribed in Practice E 1170 and a travelling speed of 50 mph ( km/h). E 867, El half cell--an electrode immersed in a suitable electrolyte. It may be designed to yield a known constant potential, in which case unknown potentials may be measured against it; for example, the calomel half cell. B 374, B half-duplex channel, n - - a data transmission channel capable of transmitting in both directions, but in one direction at a time. F 1457, F half-hard wile---as applied to aluminum, wire that has been pro- cessed so as to produce a strength approximately midway between that of soft wire and that of hard-drawn wire. B 354, B half-life--see decay constant. E 170, El half-life---the time required for one half of a given number of radioactive atoms to undergo decay. E 1316, E half-life---the time required for one half a given number of radioac- tive atoms to undergo decay. E 1316, E half-value layer--the thickness of an absorbing material required to reduce the intensity of a beam of incident radiation to one-half of its original intensity. E 1316, E half-value layer (HVL)--the thickness of an absorbing material required to reduce the intensity of a beam of incident radiation to one half of its original intensity. E 1316, E half-value thickness---the thickness of a specified substance which, when introduced into the path of a given beam of radiation, reduces its intensity to one half. E 1316, E half-wave current (I-IW)--a rectified single-phase alternating current that produces a pulsating unidirectional field. E 1316, E hall effect--a phenomenon in which a transverse electric field is produced in a current-carrying conductor placed in a magnetic field. E 1316, E halo, n - - a shadow image created by ink interaction. See also corona. F 1857, F haloearbon plastics--plastics based on resins made by the polymer- ization of monomers composed only of carbon and a halogen or halogens. D 883, D halo effect--a condition characterized by an unusually clean back- ground region at the boundary of the image areas. F 335, F halogen--any element of the family of the elements fluorine, chlo- rine, bromine and iodine (definition for purpose of this standard). D 6161, D halogen--any element of the family of the elements fluorine, chlo- rine, bromine, and iodine. Compounds do not fall under the strict definition of halogen. However, for the purpose of this standard, this word provides a convenient descriptive term for halogen- containing compounds. Of significance in halogen leak detection are those which have enough vapor pressure to be useful as tracer gases. E 1316, E halogenation treatment---exposure of the entire rubber surface area to a halogen for the purpose of reducing surface friction. F 819, F halogen leak detector--a leak detector that responds to halogen tracer gases. Also called halogen-sensitive leak detector or halide leak detector. (1) The copper-flame detector or halide torch consists of a bunsen bumer with flame impinging on a copper plate or screen, and a hose with sampling probe to carry tracer gas to the air intake of the burner. (2) The alkali-ion diode halogen detector depends on the variation of positive ion emission from a heated platinum anode when halogen molecules enter the sensing ele- ment. E 1316, E haloing--the formation of a contrasting discoloration around the edges of the workpiece when compared to interior areas. C 286, B haloing, n--the peripheral lines around print detail caused by excessive ink, excessive roller impression or faulty plate shoul- ders. D 6488, D haloing, n - - a shadow effect around the entire printed segment or
haloing, n
around the leading edge of a printed segment caused by excessive pressure between the printing plate and the printed surface. F 1294, F hamper, n--a container (commonly used for shipping fruits and vegetables) circular, elliptical, or polygonal in horizontal cross section, the tube dimensions being usually greater than the bottom. It has slotted sides and a bottom that may be loose, stapled, or nailed in place. The top may or may not be open. (Compare basket.) D 996, D H and D curvemSee characteristic curve. E 7, E handful, n--for sampling, as much fiber as the hand can contain. D 2946, C hand girth, n--the maximum circumference of the hand around the knuckles excluding the thumb, taken with the fingers together. D 5219, D handgrip, n--the part of a handrail designed to provide a secure grasp. E 631, E handgrip, n--the part of a handrail designed to provide a secure grasp. E 1481, E hand-held scanner, n - - a scanner held and operated by a human, thus enabling the scanner to be brought to the symbol. F 1294, F hand-held vacuum cleaner, n - - a small, portable, hand-held, hand- supported vacuum cleaner usually with a nozzle as an integral part of the cleaner. The cleaner is primarily designed for light-duty, all-purpose, small-area cleaning and may be designed for liquid pickup. In use, the usually integrally designed nozzle is guided over the surface area to be cleaned. The cleaner may contain a driven agitator to assist in dirt removal and may have attachments or provisions, or both, for both floor and above-the-floor cleaning. F 395, F l l handhold--any strap, handle, depression, or other provision for grasping the boom by hand. F 818, F hand length, n--the straight distance from the prominence of the longest finger to the inner wrist bone, taken across the palm of the hand with fingers together and palm flat (use a stable, flat ruler). D 5219, D handling crack, n--in a rigid die system, a defect that occurs in a green part after removal from the press, and prior to sintering. B 243, B handling damage, (HD), n---as used in fractography, scratches, chips, cracks, etc., due to the handling of the specimen/component. C 1145, C handling point, n - - a n indication of the minimum temperature to which an oil should be heated in any part of the suction or delivery line of an oil-handling installation when the installation is operat- ing. D 4175, D handling point, n - - a n indication of the minimum temperature to which an oil should be heated in any part of the suction or delivery line of an oil-handling installation when the installation is operat- ing. If the storage tank does not contain an outflow heater, this temperature is necessarily the minimum oil storage temperature. D 4175, D handling reinforcement--reinforcement intended to reduce the risk of collapse of the pipe or section during handling or storage prior to and during final placement. C 822, C hand of combination, lock installatiou--a type of lock installation that is determined by the position of the lock bolt viewed from the cover side of the door, that is, vertical up, vertical down, right hand, or left hand. F 471, F hand-overcast seam-finish, n - - a finish for the raw edges of a plain seam, in which hand stitches are taken over the raw edges of each seam allowance. D 123, D hand-overcast seam finish, n - - i n home sewing, a seam finish in which hand stitches are sewn such that the thread wraps around the cut edges of each seam allowance. D 4965, D hand print boxes---restraints for controlling entry of scannable information by hand. Controlling of size, shape, and configuration of hand printed entries on an optical scanning form. F 149, F hand print character set--Refer to ANSI X3.45-182. F 149, F
hand printing, n - - a style of writing in which the letters are not joined and the writing instrument is lifted after most strokes. E 2195, E handrail---See railing systems. E 631, E handrail, n - - a horizontal, sloping, or vertical member normally grasped by hand for guidance or support. E 631, E handrail, n - - a horizontal, sloping, or vertical member normally grasped by hand for guidance or support. E 1481, E handrail bracket--See railing systems. E 631, E handrail bracket--a device attached to a wall, post, or other surface to support the handrail. E 631, E handrail bracket--a device attached to a wall, post, or other surface to support the handrail. E 1481, E handrail height--See railing systems. E 631, E handrail height--the vertical distance from the top surface of the top rail to the surface of the finished floor, top of a ramp, or the nosing line of stair treads. E 631, E handrail height--the vertical distance from the top surface of the top rail to the surface of the finished floor, top of a ramp, or the nosing line of stair treads. E 1481, E hand-rubbed--a non-reflective surface with a slight stipple pattern, produced by hand-applied abrasive pads or hand-held machines. C 119, C handshaking, v--an exchange of signals between two devices in a computer network, as prelude to data exchange, it is to determine the readiness of each device to a data exchange. F 1457, F handsheet, n - - a sheet of fibrous material produced by a specified procedure, generally in a laboratory. D 1968, D hand washing, n--the most gentle form of home laundering using hand manipulation without the use of a machine or device such as a scrubbing board. D 123, D hand washing, n--the most gentle form of home laundering using hand manipulation without the use of a machine or device such as a scrubbing board. D 3136, D hand width, n--the maximum width across the palm of the hand excluding the thumb, taken with fingers together and palm flat (use a stable, flat ruler). D 5219, D hanging rack--see burning bars, points, or tools. C 286, B hanging wail--the mass of rock above a discontinuity surface. (ISRM) D 653, D hang pick, n - - a pick, caught on a warp yarn knot for a short distance, producing a triangular-shaped hole in the fabric. D 123, D hang pick, n - - a pick, caught on a warp yam knot for a short distance, producing a triangular-shaped hole in the fabric. (Syn. hang shot) D 3990, D hang shot--See hang pick. D 3990, D hank--specifically, a coiled or looped bundle (as of yarn, rope or wire) ususally containing a definite aggregate measure of the material. D 2864, D hardboard--a generic term for a panel manufactured primarily from inter-felted lignocellulosic fibers (usually wood), consolidated under heat and pressure in a hot-press to a density of 31 lb/ft (specific gravity 0.50) or greater, and to which other materials may have been added during manufacture to improve certain properties. medium-density hardboard--a hardboard as previously defined with a density between 31 and 50 lb/ft ~ (specific gravity between 0.50 and 0.80). high-density hardboard a hardboard as previously defined with a density greater than 50 lb/ft 3 (specific gravity 0.80). D 1554, D hardboard nail--slender, usually colored (baked-lacquer finished), stiff-stock or usually hardened-steel, usually annularly threaded, 1 to 15/8by 0.058-in. nails with small fiat head and long needle point for fastening plain or prefinished 1/8 and 1/4-in. hardboard for interior applications. Also, slender bright or colored (baked- lacquer finished), galvanized, stiff-stock, or usually hardened-steel, usually helically threaded, 2 to 3 by 0.105 and 0.120-in. nails with countersunk ¥16 or 13/64-in. head and pilot needle point for fastening hardboard for exterior applications. F 547, F
harness, n
harness, n---one or more hookup bundles tied, clamped, or otherwise fitted together for final installation; used for interconnecting electrical circuits. D 1711, D harness, n - - a piece of equipment designed to be worn by a climber or mountaineer that provides an attachment point for a rope and a means to support the climber's body during climbing, resting, rappelling, or falling. F 1773, F harness, chest, n--the part of a combination harness that fits around the upper part of the body. F 1773, F harness, combination, n - - a harness consisting of a sit harness and chest harness. F 1773, F harness, full-body, n - - a harness that fits around the upper part, the waist, and thighs of the body. F 1773, F harness leather--a self-explanatory term sometimes so defined as to include collar and saddlery leathers. Harness leather, including the related items mentioned, is practically all made of cattlehides, vegetable-tanned, except for a considerable quantity of pigskins used for making saddle seats. D 1517, D harness, sit, n - - a harness that fits around the waist and thighs of the body. Sometimes referred to as a seat harness. F 1773, F harness skip--See float. D 3990, D harsh (as in harsh asbestos)--description for asbestos with relatively high harshness. D 2946, C harshness---apparent property for asbestos that exhibits a significant degree of stiffness or rigidity. D 2946, C hat leather--usually sheepskin or calfskin for sweatbands of hats. The grain splits of sheepskin are vegetable-tanned for this purpose. D 1517, D haunch--that portion of the pipe barrel extending from bottom to springline. C 896, C haunch--that portion of the pipe barrel extending from bottom to springline. F 412, F haunching--the act of placing bedding material around the haunch of the pipe. C 896, C haunching--the act of placing bedding material around the haunch of the pipe. F 412, F hawser twist, n--the construction of cabled yam, cord, or rope in which the single and first-ply twist are in the same direction and the second-ply twist is in the opposite direction, and S/S/Z or Z/Z/S construction. D 123, D hawser twist, n--the construction of cabled yam, cord, or rope in which the single and first-ply twist are in the same direction and the second-ply twist is in the opposite direction, and S/S/Z or Z/7_/S construction. D 4849, D hazard--the adverse effect(s) that may result from exposure(s). E 943, E hazard, n--the adverse effect(s) that may result from exposure(s). E 2114, E hazard, n--source of danger; something that could harm persons or property. G 126, G hazard assessment, n--the determination of the lack of safety or degree of risk based on all integral parts of an exposure situation, including the characteristics of the chemical(s) to which one is exposed and the conditions that determine degree of exposure. F 1494, F hazardous biological materials--living biological materials, and products derived therefrom, that pose a potential threat to human health. E 1705, FA hazardous chemical--any solid, liquid, gas, or mixture thereof that can potentially cause harm to the human body through inhalation, ingestion, or skin absorption. F 1494, F hazardous material--any used or unused personal property, includ- ing scrap and waste, that is ignitable, corrosive, reactive, or toxic because of its quantity, concentration, or physical, chemical, or infectious characteristics. The property can be in a solid, liquid, semiliquid, or contained gas form and may cause or significantly contribute to an increase in mortality or serious illness, or pose a
substantial present or potential hazard to human health or the environment when improperly treated, stored, transported, dis- posed of, or otherwise managed. E 2135, E hazardous substanee--a substance defined as a hazardous substance pursuant to CERCLA 42 USC § 9601(14), as interpreted by EPA regulations and the courts: "(A) any substance designated pursuant to section 1321(b)(2)(A) of Title 33, (B) any element, compound, mixture, solution, or substance designated pursuant to section 9602 of this title, (C) any hazardous waste having the characteristics identified under or listed pursuant to section 3001 of the Solid Waste Disposal Act (42 USC § 6921) (but not including any waste the regulation of which under the Solid Waste Disposal Act ( USC § 6921 et seq.) has been suspended by Act of Congress), (D) any toxic pollutant listed under section 1317(a) of Title 33, (E) any hazardous air pollutant listed under section 112 of the Clean Air Act (42 USC § 7412), and (F) any imminently hazardous chemical substance or mixture with respect to which the Administrator (of EPA) has taken action pursuant to section 2606 of Title 15. The term does not include petroleum, including crude oil or any fraction thereof which is not otherwise specifically listed or designated as a hazardous substance under subparagraphs (A) through (F) of this paragraph, and the term does not include natural gas, natural gas liquids, liquefied natural gas, or synthetic gas usable for fuel (or mixtures of natural gas and such synthetic gas)." D 5681, D hazardous waste---any hazardous waste having the characteristics identified under or listed pursuant to section 3001 of the Solid Waste Disposal Act (42 USC § 6901 et seq.) (but not including any waste the regulation of which under the Solid Waste Disposal Act has been suspended by Act of Congress) and so forth. D 5681, D hazardous waste---liquid or solid waste, or combination of solid wastes, which because of its quantity, concentration, or physical, chemical, or infectious characteristics is capable of: (a) causing, or significantly contributing to an increase in mortality or to an increase in serious irreversible, or incapacitating reversible, ill- ness; or (b) posing a substantial present or potential hazard to human health or to the environment when improperly treated, stored, transported, or disposed of, or otherwise managed. E 631, E hazardous waste, n--waste that is listed as hazardous by the Environmental Protection Agency (EPA) and/or exhibits one or more of the following characteristics: ignitability, reactivity, cor- rosivity, or toxicity, as specified in the Code of Federal Regulations (CFR) part 261. E 833, E hazardous waste--liquid or solid waste, or combination of solid wastes, which because of its quantity, concentration, or physical, chemical, or infectious characteristics is capable of: (a) causing, or significantly contributing to an increase in mortality or to an increase in serious irreversible, or incapacitating reversible, ill- ness; or (b) posing a substantial present or potential hazard to human health or to the environment when improperly treated, stored, transported, or disposed of, or otherwise managed. E 1605, E hazardous-waste discharge--accidental or intentional spilling, hazardous-waste leaking, pumping, pouring, emitting, discharge emptying, or dumping of hazardous wastes onto any land or water. E 631, E hazardous-waste facility--all contiguous land, structures, or other appurtenances, and improvements on the land, used for treating, storing, or disposing of hazardous waste. E 631, E hazardous-waste landfill--disposal facility or part of a facility where hazardous waste is placed in or on land and that is not a land surface treatment facility, a surface impoundment, or an injection well. E 631, E hazardous-waste manifest--shipping document (EPA Form 8700-
- used for identifying the quantity, composition, origin, routing, and destination of hazardous waste during its transportation from the point of generation to the point of treatment, storage, or disposal. E 631, E
hazardous-waste small quantity generator--generator who pro- duces less than 100 kg of hazardous waste per month (or accumulates less than 100 kg at any one time) or one who produces less than 1 kg of acutely hazardous waste per month (or accumu- lates less than 1 kg of acutely hazardous waste at any one time.) E 631, E hazardous-waste storage---holding on-site of hazardous waste for a temporary period, at the end of which the hazardous waste is treated, disposed of, or stored elsewhere. E 631, E hazardous-waste treatment--any method, technique, or process, including neutralization, designed to change the physical, chemi- cal, or biological character or composition of any hazardous waste so as to neutralize it, or render it nonhazardous or less hazardous, or to recover it, make it safer to transport, store, or dispose of, or amenable for recovery, storage, or volume reduction. E 631, E haze---the cloudy or turbid aspect or appearance of an otherwise transparent specimen caused by light scattered from within the specimen or from its surfaces. D 883, D haze--the turbidity produced by the material in some cellulose derivatives that is not completely soluble in the medium. This turbidity may refer to solutions or to the solid plastic. D 1695, D haze---film whose clarity is impaired with varying degrees of opacity. D 2825, D haze, n--in reflection, (1) scattering of light at the glossy surface of a specimen responsible for the apparent reduction in contrast of objects viewed by reflection at the surface. (2) percent of reflected light scattered by a specimen having a glossy surface so that its direction deviates more than a specified angle from the direction of specular reflection. (3) cloudy appear- ance attributable to light scattering. E 284, El
haze, n--in transmission, (1) the scattering of light by a specimen responsible for the apparent reduction in contrast of objects viewed through it. (2) the percent of transmitted light that is scattered so that its direction deviates more than a specified angle from the direction of the incident beam. E 284, El
haze---the cloudy or turbid aspect or appearance of an otherwise transparent specimen caused by light scattered from within the specimen or from its surfaces. (D20) F 412, F haze--see smudge. F 549, F haze, n--in plastics, the cloudy or turbid aspect or appearance of an otherwise transparent material caused by light scattered from within the specimen or from its surfaces. F 1251, F haze---the percent of transmitted light that is scattered so that its direction deviates more than a specified angle from the direction of the incident beam, resulting in the reduction of contrast of objects viewed through the transparency. F 2429, F Hazen color, n--see platinum-cobalt color scale. E 284, El hazing, n--the fine deposit of ink on the non-image area of the gravure cylinder. It is also referred to as scumming or dirty wipe. D 6488, DO HDLC--abbreviation for high-level data link control. F 1457, F head, n--in zippers, the portion of the element that engages the pocket. D 123, D head--pressure at a point in a liquid, expressed in terms of the vertical distance of the point below the surface of the liquid. (ISRM) D 653, D head--that portion of the hide from the snout to the flare into the shoulder. D 1517, D head, n---~e portion of a element that engages the pocket. D 2050, D head, n--pressure at a point in a liquid, expressed in terms of the vertical distance of the point below the surface of the liquid. D 4439, D head--See windows and doors. E 631, E head--upset or deformation of shank, usually at or near end of shank opposite point end; formed during manufacture of nail to provide
head (total)
area to be struck by hammer during driving and to offer bearing resistance. F 547, F head and neck length, n--the distance from the crown of the head to the cervicale (contour), taken with the head erect and the neck unbent. head and neck length (infant special case), n--the distance from the crown of the head to the cervicale (contour), taken with the head erect and the neck unbent, with subject lying down flat with legs extended. D 5219, D header--see manifold. D 6161, D header tile, n--tile designed to provide recesses for brick header units in masonry faced walls. C 43, C head girth, n--inbody measurements, the maximum circumference of the head above the ears. D 123, D head girth, n--the maximum horizontal circumference of the head above the ears. D 5219, D head height--total height of head; the sum of all head elements measured parallel to nail axis; for practical purposes, measured from top of fillet to top of head. F 547, F heading--a fringe effect appearing on the leading edge (relative to copy machine feed direction) of the developed electrostatic image. F 335, F head joint--the mortar joint perpendicular to the substrate and perpendicular to the direction of the course being laid. On a floor it may be called a cross joint. C 904, C head lap, n--(1) the distance between the lower (nose) edge of an overlapping tile and the upper edge of the lapped unit in the course immediately below; (2)for shingle tile only--the distance between the lower (nose) edge of an overlapping shingle tile and the upper edge of the lapped unit in the second course below. C 43, C headlap, n--in shingles, the shortest distance between the lower edge of an overlapping shingle or sheet and the upper edge of the lapped unit in the second course below. C 1154, C headlap, n - - i n roofing, for products installed in a shingle fashion, the area on a shingle or sheet material that is covered by the requisite number of layers in multiply construction; for example, two layers on a strip shingle or three layers in a three-ply built-up roof. Headlap is commonly referred to by its width, thus the designation by linear dimension. D 1079, D headlap---the shortest distance between the lower edge of an over- lapping shingle or sheet and the upper edge of the lapped unit in the second course below. D 2946, C head length---on a hook-head or similarly headed nail, projected distance between shank and extremity of head. F 547, F headless---nail without upset or bend at head end. F 547, F head loss--the reduction in liquid pressure usually associated with the passage of a solution through a filter media bed. D 6161, D head rim--peripheral part of head. F 547, F head signature, n - - a condition where one pass of jets overlaps the next pass causing positive stitch lines. See also stitch lines. F 1857, F head space---the unfilled space in a glass container fitted with a closure device. C 162, C head space--volume in the upper portion of the dispenser not filled with liquid contents usually expressed as percent of total volume of dispenser at a specified temperature. D 3064, D headspace, n--the unfilled capacity of an ampule that allows for physical expansion due to temperature and pressure changes of the filled material while maintaining the integrity of the package. D 4175, D head, static--the height above a standard datus of the surface of a column of water (or other liquid) that can be supported by the static pressure at a given point. The static head is the sum of the elevation head and the pressure head. D 653, D head-to-shank integrity--assurance that a headed fastener under load is able to meet its mechanical and performance requirements without failure at the junction of the head to shank. F 1789, F head (total)--the sum of three components at a point: (1) elevation
