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Chapter 18

# Chapter 18 - CHAPTER 18 Temperature and the Kinetic Theory...

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CHAPTER 18 Temperature and the Kinetic Theory of Gases 1* · True or false: ( a ) Two objects in thermal equilibrium with each other must be in thermal equilibrium with a third object. ( b ) The Fahrenheit and Celsius temperature scales differ only in the choice of the zero temperature. ( c ) The kelvin is the same size as the Celsius degree. ( d ) All thermometers give the same result when measuring the temperature of a particular system. ( a ) False ( b ) False ( c ) True ( d ) False 2 · How can you determine if two bodies are in thermal equilibrium with each other if it is impossible to put them into thermal contact with each other? Put each in thermal equilibrium with a third body, e.g., a thermometer. 3 · Which is greater, an increase in temperature of 1 C ° or of 1 F ° ? An increase of 1 o C is greater. 4 · "One day I woke up and it was 20 ° F in my bedroom," said Mert to his old friend Mort. "That's nothing," replied Mort. "My room was once –5 ° C." Which room was colder? Convert 20 o F to t C ; Equ. 18-2 t C = (5/9)(20 – 32) = –6.67 o C; 20 o F is colder 5* · A certain ski wax is rated for use between –12 and –7 ° C. What is this temperature range on the Fahrenheit scale? Convert –12 and –7 o C to t F using t F = (9/5) t C + 32 t F1 = 10.4 o F; t F2 = 19.4 o F; between 10.4 o F and 19.4 o F 6 · The melting point of gold (Au) is 1945.4 ° F. Express this temperature in degrees Celsius. Use Equ. 18-2 t C = (5/9)(1954.4 – 32) = 1068 o C 7 · The highest and lowest temperatures ever recorded in the United States are 134 ° F (in California in 1913) and – 80 ° F (in Alaska in 1971). Express these temperatures using the Celsius scale. Use Equ. 18-2 t CH = (5/9)102 = 56.7 o C; t CL = (5/9)( –112) = –62.2 o C 8 · What is the Celsius temperature corresponding to the normal temperature of the human body, 98.6 ° F? Use Equ. 18-2 t C = (5/9)66.6 = 37.0 o C

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