heat flow

Rate of heat flow

The rate of heat flow between two systems is measured in watts (joules per second).

Example

Assume there are two systems with the same mass and specific heat. System A has an average temperature of 500 kelvins and system B has an average temperature of 400 kelvins. If thirty seconds after the systems are put in contact they both reach 450 K, then the average rate of heat flow is:

50 J/30 s, or rather 1.6 W.

(note: specific heat and masses = 1)

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