how do cooling pillows work? How are they so cold !!
In:
At least some of them have a material that melts at a temperature between normal room temperature and skin temperature.
This works the same way ice cools a drink, except the melting material is made in a manner that it doesn’t migrate away from its initial location when melted. This way, the pillow is cool while you are going to sleep, it heats up after a while, when you are asleep and stays warm for a while after your head is removed and the material as freezing again.
So if the pillow seems warm, just turn it over and use another part of it.
Enjoy your cool pillow – enabled by the energy consumed for phase changes.
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