Interfacial thermal resistance persists in matter hotter than the Sun
Physicists are investigating interfacial thermal resistance (ITR) in high-energy-density matter, a state of matter characterized by extreme pressure and heat. This phenomenon, where heat flow is impeded at the boundary between two materials, is a critical challenge in modern engineering and electronics cooling.
Bite into a hot pocket fresh from the microwave and you will experience one of the small injustices of physics. The crust is barely warm, yet the filling is hot enough to strip the roof of your mouth. Two materials in perfect contact, at wildly different temperatures. Leave it on the counter for a few minutes and the injustice resolves itself: heat flows from hot to cold, the filling cools, the crust warms, and everything drifts towards a common temperature.
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