Description
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Explanation & Answer
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Introduction
In this activity, we will explore how gas particle interactions at the microscopic level can explain macroscopic
phenomena such as pressure and volume. To accomplish this, we will use a computer simulation developed by
the University of Colorado.
http://phet.colorado.edu/en/simulation/gas-properties
Part I: The Relationship between n and P
For the following questions, make sure that “TEMPERATURE” is selected in the Constant Parameter
section and that gravity is set to zero. In the ADAVANCED OPTIONS, check that “Molecules Collide” is
selected.
1. What is the pressure in the gas chamber when empty?
Zero because there are no gas particles to collide
2. Make sure the heavy (blue) gas is selected and pump 40 particles into the chamber (you can do this with
the pump, or more precisely with the up/down arrows in the right menu).
a. What is the approximate pressure after adding the gas particles?
7.0psi
b. What happens to the pressure when you double the number of gas particles to 80?
14.2psi
c. What happens to the pressure when you triple the number of gas particles to 120?
20.6
d. What is the relationship between the number of gas particles and the pressure?
As th...