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What happens to the volume of a gas inside a piston if the temp does not change but the pressure is reduced?
Wiki User
∙ 14y ago
To answer this question, we must consider the gas law: PV=nRT.
This is an equation of state, so it defines relationships between pressure (P), volume (v), the number of moles in a system (n), the gas constant (R) and temperature (T). Because it is an equation of state, you cannot talk about transformations, only states in certain moments. What you can do, however, is solve the equation for nR, which is conserved.
nR = PV/T
If you hold nR constant, such as you are doing when compressing or expanding gas in a cylinder, you can say that P1V1/T1 = nR = P2V2/T2.
Considering this, what would happen to P2 if you decreased P1? To balance the equation, V would have to go down.
So if you decrease the pressure of a cylinder, but hold temperature constant, the volume would have to decrease as well.
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoAssuming your cylinder is fixed and has something like a piston allowing for potential movement, the volume will remain the same. The gas will become less densed, as with pressure its more dense.
Wiki User
∙ 11y agoAssuming we have no loss of gas from the cylinder, the volume will increase as the pressure decreases.
Wiki User
∙ 8y agoThe volume of the gas decreases!
Wiki User
∙ 14y agoIt increases.
Wiki User
∙ 14y agoDecreases
Wiki User
∙ 12y agodecreases
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