|
Unit |
Definition |
|
26-crith |
unit of mass for
weighing gases; 1 crith = the mass of 1 liter of
hydrogen gas at standard temperature and pressure |
|
27-cubit |
earliest known
unit of length; 1 cubit = approximately 45.7 cm/18
in, the length of the human forearm from the tip of
the middle finger to the elbow |
|
28-curie |
former unit of
radioactivity (symbol Ci); 1 curie = 3.7 × 1010
becquerels |
|
29-dalton |
international
atomic mass unit, equivalent to 1/12 of the mass of
a neutral carbon-12 atom |
|
30-darcy |
cgs unit (symbol
D) of permeability, used mainly in geology to
describe the permeability of rock |
|
31-darwin |
unit of
measurement of evolutionary rate of change |
|
32-decontamination factor |
unit measuring
the effectiveness of radiological decontamination;
the ratio of original contamination to the radiation
remaining |
|
33-demal |
unit measuring
concentration; 1 demal = 1 gram-equivalent of solute
in 1 cu dm of solvent |
|
34-denier |
unit used to
measure the fineness of yarns; 9,000 m of 15 denier
nylon weighs 15 g/0.5 oz |
|
35-diopter |
optical unit
measuring the power of a lens; the reciprocal of the
focal length in meters |
|
36-dram |
unit of
apothecaries' measure; 1 dram = 60 grains/3.888 g |
|
37-dyne |
cgs unit of
force; 105 dynes = 1 N |
|
38-einstein unit |
unit for
measuring photoenergy in atomic physics |
|
39-eotvos unit |
unit (symbol E)
for measuring small changes in the intensity of the
earth's gravity with horizontal distance |
|
40-erg |
cgs unit of work;
equal to the work done by a force of 1 dyne moving
through 1 cm |
|
41-yard |
imperial unit
(symbol yd) of length, equivalent to 0.9144 m/3 ft |
