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The book of Zemansky and Dittman claims that:

one two

I am confused with the first line of the second picture.

What is written, actually means that if the temperature of the body is the same as that of the walls, it will be equilibrium.

Why is that?

In other words, one could say What does equilibrium in a cavity for a body inside mean?

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  • $\begingroup$ If it has the same temperature - it is in equilibrium; its temperature won't change. $\endgroup$ – Rob Jeffries Jan 15 '17 at 13:04
  • $\begingroup$ @RobJeffries Why? It is not an assumption. There must be a reasoning. $\endgroup$ – AHB Jan 15 '17 at 13:05
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    $\begingroup$ Zeroth law of thermodynamics. $\endgroup$ – Rob Jeffries Jan 15 '17 at 13:10
  • $\begingroup$ @RobJeffries How? It's not obvious for me. Can you explain in more details? $\endgroup$ – AHB Jan 15 '17 at 13:12
  • $\begingroup$ see physics.stackexchange.com/questions/78783/… $\endgroup$ – Rob Jeffries Jan 15 '17 at 13:15

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