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ColdIronAegis t1_j2646q0 wrote

Reply to comment by Drone30389 in TIL Snow is an excellent insulator because it consists of about 90–95 percent trapped air (fresh). This is the reason why igloos are warmer inside than outside, and why some animals in colder regions build snow caves to spend the winter while hibernating. by SunCloud-777

The term they meant to use is "Heat Capacity".

Water has a high heat capacity; it takes a relatively high amount of heat (energy) to cause a change in temperature.

This is also why it makes a good coolant, as it can then transfer that heat.

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