Thermal Physics

# Thermal Physics - PHYS 258 Thermal Physics Student ID...

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PHYS 258 - Thermal Physics: Assignment 1 Due Monday January 17 Student ID: Last Name: Score: /12 ________________________________________________________________ 1. Short answer questions: (1) a) A thermometer is placed in intergalactic space. What temperature does it read? Briefly explain (find answer in the internet). (hint: it is not zero) (0.5) (b) Prove that the volume thermal expansion coefficient of a solid is equal to the sum of its linear expansion coefficients in the three directions: β = α x + α y + α z . (0.5) Estimate the speed of oxygen molecules in your room. Calculate the mass of a mole of: (0.5) a) Nitrogen, N 2 (0.5) b) Oxygen, O 2 (0.5) c) Argon, Ar (0.5) d) Air, which is a mixture of N 2 (78% by volume), O 2 (21%), and argon (1%)

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2. Volume Thermal Expansion. Near room temperature, when the temperature of liquid mercury increases by one degree Celsius, its volume increases by one part in 5500. (1)
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## This note was uploaded on 06/11/2011 for the course PHYS 258 taught by Professor Yurileonenko during the Winter '11 term at Waterloo.

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Thermal Physics - PHYS 258 Thermal Physics Student ID...

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