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How are pressure, volume and temperature related to the behavior of gases?

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hyun980106 | Student, Undergraduate | eNotes Newbie

Posted April 27, 2009 at 11:01 AM via web

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How are pressure, volume and temperature related to the behavior of gases?

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enotechris | College Teacher | (Level 2) Senior Educator

Posted April 27, 2009 at 10:49 PM (Answer #1)

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Pressure and volume of a gas are inversely related.  As one goes up, the other goes down, and vice-versa.  Pressing down on a bicycle tire pump illustrates that by decreasing the volume, squeezing the air into a smaller space, the pressure increases, and forces it through the hose into the tire.  This inverse relationship is summarized by

Pressure = 1/Volume   and   Volume = 1/Pressure  or

P= 1/V  and V = 1/P

This relationship can be summarized as the pressure times volume of initial conditions is equal to the pressure times volume of the final conditions, or

(Pressure 1)(Volume 1) = (Pressure 2)(Volume 2)

Adding the variable of temperature causes the volume and pressure to increase or decrease as the temperature increases or decreases.  The formula to describe that is a bit more complex, including n as the number of moles of the gas and R which is the gas constant:

(Pressure)(Volume) = (number of moles)(gas constant)(temp)

PV= nRT

 

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revolution | College Teacher | Valedictorian

Posted February 23, 2010 at 11:04 PM (Answer #2)

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Their relationship is inverselly proportionated in some way, and affects the gas the same way.

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