Lecture14

# Lecture14 - Major Concepts in Physics Lecture 14 Prof Simon...

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PHY102 1 Major Concepts in Physics Lecture 14. Prof Simon Catterall Office 309 Physics, x 5978 http://physics/courses/PHY102.08Spring

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PHY102 Plan for today … quick tour of some concepts of thermodynamics … ± Temperature, heat. Thermal equilibrium ± Ideal gases – gas laws ± Real gases – molecular interactions ± Internal energy, work and 1 st law of thermodynamics
PHY102 Temperature ± This is a measure of the mean kinetic energy of the atoms/molecules that comprise body ± Simplest ex. Ideal gas. Gas comprises a (very) large number of atoms in random motion ± I mole=number atoms in 12 g of carbon Assume all atoms move independently except for collisions 1 23 A mol 10 022 . 6 - N × =

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PHY102 Absolute (Kelvin) temperature ± Mean kinetic energy=1/2m<v 2 > = 3/2 kT <v 2 > means average squared speed Same temperature scale we used for thermal radiation Square root of this is called the rms speed k = 1.38 × 10 -23 J/K is Boltzmann’s constant
PHY102 The distribution of speeds in a gas is given by the Maxwell- Boltzmann Distribution .

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PHY102 Example (text problem 13.70): What are the rms speeds of helium atoms, and nitrogen, hydrogen, and oxygen molecules at 25 ° C? m
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Lecture14 - Major Concepts in Physics Lecture 14 Prof Simon...

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