. A high-vacuum system in a physics research lab can achieve a pressure as low at 1.00x10-7 N/m2 at 20.0°C. (a) How many molecules are there in a cubic centimeter at this pressure and temperature? (b) To achieve half of the above density at the same pressure, what would the temperature need to be?

. A high-vacuum system in a physics research lab can achieve a pressure as low at 1.00x10-7 N/m2 at 20.0°C. (a) How many molecules are there in a cubic centimeter at this pressure and temperature? (b) To achieve half of the above density at the same pressure, what would the temperature need to be?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter19: Temperature, Thermal Expansion And Gas Laws

Section: Chapter Questions

Problem 39PQ

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Concept explainers

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.

Question

. A high-vacuum system in a physics research lab can achieve a pressure as low at 1.00x10-7 N/m2
at 20.0°C.
(a) How many molecules are there in a cubic centimeter at this pressure and temperature?
(b) To achieve half of the above density at the same pressure, what would the temperature
need to be?

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