Gas Behavior: Pressure-Volume Isotherms
The applet below illustrates
pressure-volume isotherms for gases.
temperatures of the isotherms by clicking
on the temperature labels and dragging
them up or down.
limits can be adjusted by clicking on an
axis and dragging, right or left for the
volume axis and up or down for the
"van der Waals gas" or
"real gas" is selected, the van
der Waals "a" parameter models
the attractive forces between gas
molecules while the "b"
parameter models the repulsive
forces. To see the difference,
first set a = 0 and adjust b. Then
set b = 0 and adjust the a parameter.
"real gas" one can see the
horizontal regions of the plot which
depict the areas where fluid is
condensing from the gas phase to liquid.