• lolcatnip@reddthat.com
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    1 year ago

    You can dump energy into something by blasting photons at it, because photons carry energy. You can’t do the reverse because you’d need to use particles with negative energy. Either that, or you’d need to suck photons out of the food, but it doesn’t work that way; things radiate photons at a specific frequency and intensity (called blackbody radiation) depending on how hot they are, and you can’t make them emit more energy except by getting them hotter.

      • Scrappy@feddit.nl
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        1 year ago

        Can I get an ELI5 of this principle? I read the Doppler cooling part but I can’t connect the dots.

        • hstde@feddit.de
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          1 year ago

          Heat energy is the amount of particle wiggling. With precisely tuned and oriented lasers you can clamp a particle in space, thus prevent it from wiggling.

          No wiggling -> very cold.

    • beteljuice@lemmy.ml
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      1 year ago

      Considering room pressure and temperature, things are not cooling at their fastest possible rate. Blackbody radiation isn’t the only way things cool down. You are forgetting conduction and convection. Liquid nitrogen can cool things down super quickly.

      • lolcatnip@reddthat.com
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        1 year ago

        I’m not forgetting them: they’re just but relevant to the way I interpreted the question. I’m assuming OP wants something that works on a similar physical principle to a microwave, not just a fast way to chill things.