# If the pressure on a gas increases, does the volume of the gas also increase?

##### 2 Answers

#### Answer:

If the pressure on the gas increases, the volume of the gas does not increase. Instead, the volume decreases.

#### Explanation:

According to the general equation of the ideal gases, we have:

PV = nRT ............................................. (1)

Therefore, for a given quantity of the gas (n = constant), and at a given temperature (T = constant), equation (1) will be reduced to:

PV = constant ............................ (2)

In other words, the volume "V" is inversely proportional to the pressure "P". Thus, if the pressure "P" increases, the volume "V" will decrease.

With kind regards

Dr. Mamdouh Younes

Hamilton, Ontario, Canada

Maybe, maybe not.

As

If the gas is in a ** closed rigid** container, and it already spreaded out to fill the entire container, then if pressure increases (for instance, by adding more of the same gas), its temperature can increase.

This would be then, an example of *constant-volume* (isovolumetric/isochoric) compression. From the ideal gas law:

#VDeltaP = RDelta(nT)#

or

or

If pressure increases,

Again, this would occur when the volume is held constant, which is quite feasible. In this case, the volume of the gas, again, would not change.