Gas Laws

Question 1

Boyle’s Law

Answer 1

The absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain unchanged within a closed system

Question 2

Boyle’s Law equation

Answer 2

K = PV or K= P1xV1 = P2xV2

Question 3

Charles’ Law

Answer 3

At a constant pressure the volume of a mass of gas is proportional to the absolute temperature

Question 4

Charles’ Law equations (pressure is constant; volume is constant)

Answer 4

V1/V2 = T1/T2 and P1/P2 = T1/T2

Question 5

Dalton’s Law

Answer 5

The total pressure of a gas mixture equals the sum of the partial pressures that make up the mixture

Question 6

Henry’s Law

Answer 6

At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.

Question 7

Ideal Gas Law

Answer 7

The ratio between the pressure-volume product and the temperature of a system remains constant.

Question 8

Ideal Gas Law equation

Answer 8

P1 x V1 /T1 = P2 x V2 /T2

Question 9

Adiabatic heating and cooling

Answer 9

changes in temperature related to changes in the pressure of a gas that do not involve temperature exchanges with the surroundings. (Cylinders heat up when charged; cool down when emptied quickly)

Question 10

Compression Factor

Answer 10

a way to measure the compressibility of a gas. An ideal gas has a compressibility factor of 1 up to a pressure of 200bar. Compressed passed 200bar the factor decreases; important to consider when calculating air supply.

Question 11

Compression factor formula

Answer 11

Free Gas Volume = Floodable Volume x Pressure

Question 12

Dalton’s law equation

Answer 12

Ppx = (V% x P) / 100%