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According to Boyle's law, the volume V of a gas at a constant temperature varies inversely with the pressure P. When the volume of a certain gas is 125 cubic meters, the pressure is 20 psi (pounds per square inch).

If the volume of gas is increased to 400 cubic meters, the pressure will be

  • Physics -

    At constant temperature (which is what they want you to assume),
    P*V = constant
    125*20 = 400*P2
    P2 = final pressure = (125/400)*20
    = 6.25 psi

    Since the equation
    P1/P2 = V2/V1
    involves dimensionless ratios, I did NOT have to convert pressure from psi to Pascal units and back again. I chose to keep pressure in psi and volume in cubic meters

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