Becquerel-
The unit of radioactive decay equal to 1 disintegration per
second; 37 billion (3.7x10 10 ) becquerels = 1 curie (Ci).
Bel-
A unit of level of which denotes the ratio between two
quantities proportional to power; the number of bels corresponding to this ratio
is the logarithm to the base 10 of this ratio (1 bel = 10
decibels).
Bohr- A unit of distance used in
particle physics; the bohr radius represents the mean distance between the
proton and the electron in an unexcited hydrogen atom; it equals about 52.918
picometers (pm), or 52.918 x 10-12 meters (the unit is named for the Danish
physicist Niels Bohr (1885-1962), who explained the structure of atoms in a
famous paper in 1913.
British
thermal unit- (BTU) A unit of energy defined as that
quantity of heat required to raise the temperature of one pound of water by one
degree Fahrenheit; it is equal to 252.1 calories or 1055
joules.
