About site: Physics/Thermodynamics - Ideal Gas Law

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Title: Physics/Thermodynamics - Ideal Gas Law Applet illustrating the ideal gas law : action of a piston in a pressure chamber filled with ideal gas.

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Virtual Laboratory: Ideal Gas Law Thermodynamics Ideal Gas Law Page 1

Welcome to the Pressure Chamber

Experimental Instructions

In this series of experiments, you will control the action of a pistonin a pressure chamber which is filled with an ideal gas. The gas is definedby four states: Temperature Volume or density Pressure Molecular Weight There are 3 possible experiments to do. In the third experiment, labelledIdeal Gas Law, you can select from the Red, Blue or Yellow gas containers.Each gas in those containers has a different molecular weight and henceeach will respond differently under changing pressure conditions. Be sure that the pressure in the chamber neverexceeds 10 atmospheres !!! If the pressure exceed this amount, the chamber will crack and the gaswill leak out and your experiment will be over. Even though this is virtualgas, its effects could be unpredictable. This experiment is setup so that changes in the state of the gas, e.g.its Temperature, Volume and Pressure, are automatically recorded on thegraphical tool. This should guide the experimenter into understanding therelationships of the Ideal Gas Law.

First Experimental Procedure

click on the button titled constant volume - you will see that thedefault variable to plot are now pressure vs temperature Now, for obscure reasons, you must prime the plotting tool. Grab the thermometer with your pointing device and raise the temperatureto around 400 degrees and release the pointing device. Now lower the temperature back to around 300 degrees Now raise the temperature back to 400 degrees. You should now see agraph with one or possible 2 points plotted. From now one the graph willrespond to each new temperature position. Change the temperature by moving the thermometer up and down; eachtime you release the pointing device a new point should appear. Do thisuntil about 10 data points are plotted. What is the relationship between pressure and temperature at constantvolume? Using this data, predict at what temperature the pressure will exceed10 units You may test this prediction but be sure to reset the experiment afterthe chamber breaks.

Second Experimental Procedure

Click on the button entitled constant temperature Now go to the control panel under the piston where there is a buttonwith a single arrow on it. This is the rightmost of the two buttons. Each click of that button will depress the piston into the cylinder.Notice the pressure and volume meters change. Each click will plot 4 datapoints on the graph Being careful not to crack the cylinder with excess pressure, plotout the relation between pressure and volume as the temperature is heldconstant. From the form of the plot, can you guess the relation between pressureand volume when the temperature is held constant.

Third Experimental Procedure

Click on the button titled Ideal Gas Law Select one of the gases, either Red ,Blue , Yellow .These gasses have different molecular weights and hence have a differenttemperature and pressure response when the volume is changed. Each gashas the same starting temperature. Which of these gases can be raised to the highest temperature withoutbreaking the cylinder? Estimate the temperature dependence on volume reduction for each ofthe three gases. If you were designing a pressure cylinder for the blue gas, approximatelywhat pressure would it have to withstand when the temperature of that gasreaches 2000 K. What about for the yellow gas? Which of these gases has the lowest molecular weight? End of This experiment.

Applet	illustrating	the	ideal
gas	law	:	action	of
a	piston	in	a	pressure
chamber	filled	with	ideal	gas.

http://jersey.uoregon.edu/vlab/Piston/index.html

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Applet illustrating the ideal gas law : action of a piston in a pressure chamber filled with ideal gas.

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