1. Physics 52 - Heat and Optics Dr. Joseph F. Becker Physics Department San Jose State University © 2003 J. F. Becker

2. Chapter 15 Temperature and Heat THERMODYNAMICS © 2003 J. F. Becker San Jose State University Physics 52 Heat and Optics

4. Fig. 15-1 Thermometers are used to measure temperature – a measure of hotness and coldness. (a) A system whose temperature is specified by the value of the length L. (b) A system whose temperature is specified by the value of the pressure p.

5. Fig. 15-2 The Zeroeth Law of Thermodynamics. (a) If systems A and B are each in thermal equilibrium with system C, then (b) A and B are in thermal equilibrium with each other. Blue = insulation, red = conducting material.

6. Fig. 15-3 (a) A bimetallic strip bends when heated because one metal (red) expands more than the other. (b) A bimetallic strip, usually in the form of a spiral, may be used as a thermometer.