Ultrashort wave can be heated

Ultra-short wave can be heated, the international has a unified agreement for civilian heating, special provisions of the frequency band, not randomly. For example: commonly used civil microwave frequency, 433MHz, 915MHz (L-band), 2450MHz (S-band), commonly used in industrial, medical use of the heating frequency, household microwave ovens are generally 2450MHz, of course, there are other frequencies, other bands (such as C, K-band). Early plastic laminators are generally 60MHz or so for the ultra-short wave, later replaced by a simple low-cost electric heating wire heating. There are also some medical physical therapy equipment, the use of ultrashort waves, the use of its thermal and non-thermal effects. What frequency is selected according to the comprehensive aspects of consideration.