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Get Full Access to An Introduction To Thermal Physics - 1 Edition - Chapter 3 - Problem 2p
Get Full Access to An Introduction To Thermal Physics - 1 Edition - Chapter 3 - Problem 2p

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# Use the definition of temperature to prove the zeroth law ISBN: 9780201380279 40

## Solution for problem 2P Chapter 3

An Introduction to Thermal Physics | 1st Edition

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Problem 2P

Problem 2P

Use the definition of temperature to prove the zeroth law of thermodynamics, which says that if system A is in thermal equilibrium with system B, and system B is in thermal equilibrium with system C, then system A is in thermal equilibrium with system C. (If this exercise seems totally pointless to you, you’re in good company: Everyone considered this “law” to be completely obvious until 1931, when Ralph Fowler pointed out that it was an unstated assumption of classical thermodynamics.)

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Solution

Step 1

The definition of temperature in terms of entropy is System in thermal equilibrium have equal slopes in their entropy-versus-energy graph and the temperature is same. The zeroth law of thermodynamics states that if a system A is separately in thermal equilibrium with two other systems B and C then B and C are in thermal equilibrium with each other.From the definition of temperature above, since any two systems in thermal equilibrium have the same values of the system B and C must both have the same slope as system A. So they all have the same slopes each other.

Step 2 of 2

##### ISBN: 9780201380279

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