Problema Solution
The volume, V, of a gas varies inversely as the pressure, P, on it. If the volume is 180 cm3 under pressure of 40 kg/cm2, what pressure has to be applied to have a volume of 360 cm3 ?
Answer provided by our tutors
If the volume, V varies inversely as the pressure P we can write
V = k/P, where k is constant
thus k = V*P and P = k/V
If V = 180 cm3 then P = 40 kg/cm2 and we can find k
k = 180 * 40
If V = 360 cm3 we need to find P
P = k/V
P = 180*40/360
P = 30 kg/cm2
we have to apply pressure of 30 kg/cm2 to have a volume of 360 cm3.