ASHRAE Terminology

A Comprehensive Glossary of Terms for the Built Environment
ashrae.org/ashraeterms

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frequency

(1) number of cycles per second through which an alternating electric current passes, in North America, frequency is generally standardized at 60 cycles per second (60 Hz). Most other countries standardize using 50 Hz. (2) the number of times a quantity (such as a sound wave) repeats itself in one second.