Overview 17 Zeroth Law and Equilibrium Temperature and Scales

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Presentation transcript:

Overview 17 Zeroth Law and Equilibrium Temperature and Scales Gas Thermometers

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

Celsius Fahrenheit Conversions

Gas Pressure versus Temperature Gas Pressure versus Temperature

Kelvin Temperature Scale Kelvin Temperature Scale Example: Convert 20C to kelvins. 20 degrees C = 20 + 273.15 = 293 K

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.

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

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

17-4 The Ideal-Gas Law

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

Thermometers

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

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

Kinetic theory based on collision forces

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