The rate at which something occurs over a particular period of time. In the context of our fabrics, frequency describes the number of waves that pass a fixed point in a given amount of time.
For example if the time it takes for a wave to pass is ½ second, the frequency is 2 per second. If it takes 1/100 of an hour, the frequency is 100 per hour.
Frequency is measured in Hertz (Hz) and is named after the German physicist Heinrich Hertz.Frequency is the measure of 1 wave cycle per secod (1 Hz).
Units of measure
Source: NASA, EPA, Howstuffworks.com