Rate of heat flow

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

[edit] 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)

[edit] See also

• Heat transfer
• Heat conduction
• Heat flux
• Watt
• Flux