| barrel of oil equivalent | A unit of energy equal to the amount of energy contained in a barrel of crude oil. Approximately 5.78 million Btu or 1,700 kWh. A barrel is a liquid measure equal to 42 gallons. (05 Dec 1998) |
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| gold equivalent | A unit of power of the protective colloids; the number of milligrams of protective colloid just sufficient to prevent the precipitation of 10 ml of a 0.0053 to 0.0058% gold solution by the action of 1 ml of a 10% sodium chloride solution. Synonym: gold number. (05 Mar 2000) |
| gram equivalent | The weight in grams of an element that combines with or replaces 1 gram of hydrogen, the atomic or molecular weight in grams of an atom or group of atoms involved in a chemical reaction divided by the number of electrons donated, taken up, or shared by the atom or group of atoms in the course of that reaction, the weight of a substance contained in 1 liter of 1 normal solution; a variant of. Synonym: combining weight, equivalent weight. (05 Mar 2000) |
| metabolic equivalent | The oxygen cost of energy expenditure measured at supine rest (1 MET = 3.5 ml O2 per kg of body weight per minute); multiples of MET are used to estimate the oxygen cost of activity, e.g., 3 to 5 METs for light work; more than 9 METs for heavy work. (05 Mar 2000) |
| roentgen-equivalent | <radiobiology> A unit of dose equivalent to that quantity of ionizing radiation of any type that produces in man the same biologic effect as one rad of X-rays or gamma rays; the number of rems is equal to the absorbed dose, measured in rads, multiplied by the quality factor of the radiation in question.100 rem = 1 Sv. (05 Mar 2000) |
| roentgen-equivalent physical | <radiobiology, unit> A roentgen equivalent physical is a unit of absorbed radiation approximately equivalent to a roentgen, an international unit of x- or gamma-radiation. An obsolete unit of measurement; that quantity of ionizing radiation of any kind which, upon absorption by living tissue, produces an energy gain per gram of tissue equivalent to that produced by 1 roentgen of X-rays or gamma-rays. Acronym: rep See: rad. (05 Mar 2000) |
| combustion equivalent | The heat value of a gram of carbohydrate or fat oxidised outside the body. (05 Mar 2000) |
| starch equivalent | The amount of oxygen consumed in the combustion of a given weight of fat as compared with that consumed in the combustion of an equal weight of starch; the figure is about 2.38, that for starch being taken as 1. (05 Mar 2000) |
| nitrogen equivalent | The nitrogen content of protein; used in calculating the protein breakdown in the body from the nitrogen excreted in the urine, 1 g of nitrogen considered as having originated in 6.25 g of protein catabolised. (05 Mar 2000) |
| toxic equivalent | The amount of toxin or other poison per kilogram of body weight necessary to kill an animal. (05 Mar 2000) |
| equivalent | Having the same value, neutralising or counterbalancing. Origin: L. Aequivalens, from aequus = equal, valere = to be worth (11 Nov 1997) |
| equivalent dose | In radiation protection, the absorbed dose averaged over a tissue or organ and weighted for the quality of the radiation of interest. The unit of equivalent dose is the sievert. (05 Mar 2000) |
| equivalent extract | A fluidextract of the same strength, weight for weight, as the original drug. Synonym: valoid. (05 Mar 2000) |
| equivalent focal length | <microscopy> The focal length of the simple lens that has the same power as the compound lens. The stated focal lengths of microscope objectives are the equivalent focal length since their front and back focal lengths are very different. (05 Aug 1998) |
| equivalent form reliability | In psychology, the consistency of measurement based on the correlation between scores on two similar forms of the same test taken by the same individual. See: reliability coefficient. (05 Mar 2000) |