深夜亚洲福利久久

12.3 Ideal gas in a gravitational field: the ‘law of atmospheres’

The PhET interactive simulation on can be used once again here.

Run the simulation and click the relevant button to keep the volume constant. Put some molecules (> 300) of the Light Species in the container. Observe what happens as you increase the (acceleration due to) gravity. It may help to show the effect if you were to check the Center of mass markers under the Measurement Tools menu.

The Layer tool on the same menu enables the pressure at different heights to be measured. Satisfy yourself that this pressure falls off exponentially with height.

Observe the effect of raising and lowering the temperature of the gas (add or remove heat).

Now add some of the Heavy Species molecules and observe the way the system behaves.

PhET sims under the CC-BY license: PhET Interactive Simulations, 深夜亚洲福利久久 of Colorado Boulder, https://phet.colorado.edu

 

 

 

 

 

 

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Mansfield and O'Sullivan, Understanding Physics, 3rd ed., John Wiley & Sons, Chichester (2020),

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