Sunlight can cause a molecule to change structure, and then release heat later.

  • Noodle07@lemmy.world
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    2 months ago

    Kinda like the pocket heater bags that turns hot when you pop the metal piece inside of it ?

    • CannonFodder@lemmy.world
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      2 months ago

      Kinda. Except it’s uv light that recharges it, and it stays a liquid. And it’s quite a lot higher energy density.