1. Overview 17 Zeroth Law and Equilibrium Temperature and Scales
Gas Thermometers

2. Thermal Equilibrium 0th Law
thermal equilibrium: zero net heat flow while in thermal contact

3. Celsius Fahrenheit Conversions

4. Gas Pressure versus Temperature
Gas Pressure versus Temperature

5. Kelvin Temperature Scale
Kelvin Temperature Scale
Example: Convert 20C to kelvins.
20 degrees C = = 293 K

6. Summary: Thermal Equilibrium and Zeroth Law
Temperature and scales and conversions
Thermometric properties and thermometers
Ideal Gas Law
Kinetic Theory explains gas behavior in terms of Newton’s Laws of Motion.

8. The absolute temperature of a gas is most closely associated with its molecules average
Velocity
Speed
(Speed)2
Momentum 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

9. What happens to the pressure of an ideal gas going from state A to B?
Increases
Decreases
No change 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

11. 17-4 The Ideal-Gas Law

12. Ideal Gas A gas obeying “billiard ball” rules
no long-range interactions
PV is proportional to T

15. Thermometers

16. Thermometric property: a physical property that changes with temperature.
Examples:
pressure or volume of a gas
volume of a liquid
resistance of a metal
length of a piece of metal

17. 17-5 The Kinetic Theory of Gases
17-5 The Kinetic Theory of Gases

18. Kinetic theory based on collision forces