Lecture23

# Lecture23 - PHYSICS 220 Lecture 23 Temperature and Ideal...

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Lecture 23 Purdue University, Physics 220 1 Lecture 23 Temperature and Ideal Gas Textbook Sections 13.1 - 13.4 PHYSICS 220

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Lecture 23 Purdue University, Physics 220 2 Overview • Last Lecture – Speed of sound v = sqrt(B/ ρ ) – Intensity level β = (10 dB) log 10 ( I / I 0 ) – Standing Waves • f n = n v/(2L) open at both ends n=1,2,3,… • f n = n v/(4L) open at one end n=1,3,5,… – Doppler Effect f o = f s (v-v o ) / (v-v s ) – Beats • Today – Temperature – Thermal Expansion – Ideal Gas
Lecture 23 Purdue University, Physics 220 3 Internal Energy All objects have “internal energy” (measured in Joules) – random motion of molecules • kinetic energy – collisions of molecules gives rise to pressure Amount of internal energy depends on – temperature • related to average kinetic energy per molecule – how many molecules • mass – “specific heat” • related to how many different ways a molecule can move – translation – rotation – vibration • the more ways it can move, the higher the specific heat

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Lecture 23 Purdue University, Physics 220 4 Temperature Feel Measure
Lecture 23 Purdue University, Physics 220 5 Zeroth Law of Thermodynamics • If two objects are in thermal equilibrium with a third, then the two are in equilibrium with each other. • If they are in equilibrium, they are at the same temperature.

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Lecture 23 Purdue University, Physics 220 6 Temperature Scales Lord Kelvin (1824 - 1907) Anders Celsius (1701 - 1744) Daniel G. Fahrenheit (1686 - 1736)
Lecture 23 Purdue University, Physics 220 7 Water boils Water freezes 212 32 Farenheit 100 0 Celcius 273.15 373.15 Kelvin NOTE: K=0 is “absolute zero”, meaning (almost) zero KE/molecule Temperature Scales

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Lecture23 - PHYSICS 220 Lecture 23 Temperature and Ideal...

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