# Physics - Gases - Problems with Solutions and Tutorials

gases
There are 300 mL of gas in your bowels. You decide to take an after-dinner bath, which raises your temperature from 37 C to 40 C. How many mL of gas do you have now?

Solver Input: Vi=300mL,Ti=37C,Vf=?mL,Tf=40C

Tutorial video:
gases
At rest, you have a body temperature of 37 C, and 300 mL of gas at a gauge pressure of 3.14 psi in your bowels. You decide to do some sit ups, which raise your body temperature to 38.5 C, and compress your gas to 250 mL. What is the gauge pressure now?

Solver Input: Ti=37C,Vi=300mL,P_gaugei=3.14psi,Tf=38.5C,Vf=250mL,P_gaugef=?psi

Tutorial video:
gases
You just purchased a 660 L tank of oxygen at 2000 psi stored at room temperature (20 C). The molecular weight of O2 is 32g/mol. How many mols of oxygen is in the cylinder? How many molecules of O2 is that? How many kg is that?

Answer: n=3734 mol, N=2.25e+27, m=119 kg

Solver Input: V=660L,P=2000psi,T=20C,M=32g/mol,n=?,N=?,m=?

Tutorial video:
gases
Oxygen has a density of 1.326 g/L at STP. What is oxygen's density on a hot summer's day when the temperature is 90 degrees Fahrenheit?