speed measurement
71length — (lg) an informal unit of distance. The distance between competitors in horse races, boat races, and similar situations is naturally expressed in lengths, with one length equal to the average length of a horse, boat, etc. In horse racing, the… …
72light year — (ly) a unit of distance used in astronomy. One light year is the distance that light travels in one year through a vacuum (and, of course, most of the Universe is close to being a vacuum). In the official definition of the International… …
73meter per second — (m/s) the metric and SI unit of speed or velocity. One meter per second is equal to exactly 3.6 kilometers per hour (km/h) or about 2.236 936 miles per hour or 3.280 840 feet per second …
74mile — (mi) 1. a traditional unit of distance. The word comes from the Latin word for 1000, mille, because originally a mile was the distance a Roman legion could march in 1000 paces (or 2000 steps, a pace being the distance between successive falls… …
75mips — a unit of computing power equal to one million instructions per second. An instruction is a single program command to the computer s central processor. In a particular computer, there is a definite relationship between the rate at which… …
76Planck length — a unit of distance representing the scale at which gravity, and perhaps space itself, becomes quantized (discrete) rather than continuous. This is the shortest distance that is meaningful in our understanding of the laws of physics. The Planck …
77Planck time — a unit of time equal to the time required for a photon moving at the speed of light to travel the distance of one Planck length. This is the shortest time that is meaningful in our understanding of the laws of physics, representing the scale… …
78poise — (P, Ps, or Po) a CGS unit of dynamic viscosity. Viscosity is a frictional property (actually, several related properties) of liquids and gases: due to friction between molecules, the liquid or gas resists flowing to a greater or lesser extent …
79redshift — (z) a unit of relative distance used in astronomy. The universe is expanding, so distant galaxies are receding from the earth. The faster the speed of recession, the farther the object. Just as sound from a receding train is lowered in pitch,… …
80second — 1. (s or sec or ) a fundamental unit of time in all measuring systems and the SI base unit of time. The name simply means that this unit is the second division of the hour, the minute being the first (see minute [0]). The second was defined …
