Answer :
The National Kitchen and Bath Association recommends that the bottom of the microwave should be no higher than 54 inches above the floor, which would allow for 18 inches of clearance between the microwave and the typical cooktop height of 36 inches. Some manufacturers allow smaller clearances.
What is microwave ?
Microwave radiation has wavelengths between one meter and one millimeter, which correspond to frequencies between 300 MHz and 300 GHz, respectively. The term "microwaves" refers to a variety of frequency bands; the wide definition given above covers both the UHF and EHF (millimeter wave) bands. The range from 1 to 100 is a more typical definition in radio-frequency engineering.
The word "microwave" does not necessarily imply a wavelength in the micrometer range, despite the prefix micro-. Instead, it means that, in comparison to the radio waves employed before the invention of the microwave, microwaves are "little" (having shorter wavelengths).
Far-infrared, terahertz, microwave, and ultra-high-frequency radio waves are divided into these categories arbitrarily and in varied ways by various scientific disciplines.
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