Assorted References. 1  major reference (in celestial mechanics: Keplerâs laws of planetary motion) 2  astronomy (in physical science: Astronomy) (in astronomy: Kepler) 3  celestial mechanics (in mechanics: History) 4  discovery and formulation (in Johannes Kepler (German astronomer)) 5  geometry (in geometry: Pythagorean numbers and Platonic solids)
From Wikipedia, the free encyclopedia. In chemical kinetics, the overall rate of a reaction is often approximately determined by the slowest step, known as the rate determining step (RDS) or rate-limiting step.
In mathematics, a rate is the ratio between two related quantities. Often it is a rate of change. If the unit or quantity in respect of which something is changing is not specified, usually the rate is per unit time.However, a rate of change can be specified per unit time, or per unit of length or mass or another quantity.The most common type of rate is per unit time, such as speed, heart rate and flux. Ratios that have a non-time denominator include exchange rates, literacy rates and electric flux.n describing the units of a rate, the word per is used to separate the units of the two measurements used to calculate the rate (for example a heart rate is expressed beats per minute).