Measuring the heat capacity of condensed light: Method can be used for ultra-precise thermometers

Liquid water is a very good heat storage medium -- anyone with a Thermos bottle knows that. However, as soon as water boils or freezes, its storage capacity drops precipitously. Physicists have now observed very similar behavior in a gas of light particles. Their findings can be used, for example, to produce ultra-precise thermometers.

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