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Message: <blockquote data-quote="AnuradhaRa" data-source="post: 28445674" data-attributes="member: 325076"><a href="https://www.quora.com/Do-light-waves-heat-up-the-objects-they-pass-through-just-as-microwaves-do" target="_blank">Almost all electromagnetic radiation can heat up objects. </a><img src="/styles/default/xenforo/smilies/default/shocked.gif"  class="smilie" loading="lazy" alt=":shocked:" title="Shocked    :shocked:" data-shortname=":shocked:" />Why do microwaves heat up food, but other electromagnetic waves with higher energies (like UV and visible light) do not?Microwaves do a better job of heating food for two simple reasons:<ol> <li data-xf-list-type="ol">They penetrate. Microwaves in a consumer microwave oven have a wavelength of 5 inches, whereas visible light or UV has such a short wavelength that it only heats up the skin like a conventional oven.</li> <li data-xf-list-type="ol">They are absorbed by water. Visible light passes right through water.</li> </ol>Also, since the frequency used in microwave ovens is chosen to be good at heating up water, it is also a frequency that will not interfere with any microwave radio or TV communications. A frequency that is absorbed by rain is not useful for communications.</blockquote>

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