Speed of Sound

Why is vacuum a good insulator?

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March 24, 2013 3:48PM

A vacuum is a good insulator because it prevents the transfer of heat by eliminating the medium (matter).
A perfect vacuum is the absence of matter. Heat is transferred by conduction, convection and radiation. Radiation is the only form of heat transfer that does not need a medium. Furthermore, radiation is generally the least efficient method of heat transfer.