Gas Laws

Question 1

What is Charles’ Law?

Answer 1

For a fixed mass of gas at a constant pressure, volume id directly proportional to the temperature.
(as temp increases, volume increases).

Question 2

What is Boyle’s Law?

Answer 2

For a fixed mass of gas the product of volume and pressure are always the same providing the temp is constant.
(if pressure increases, the volume decreases).

Question 3

What is atmospheric pressure?

Answer 3

This is the constant movement and collision of gas particles exerts pressure.

Question 4

What is pressure exerted by the air known as?

Answer 4

Barometric pressure (kPa).

Question 5

What is the barometric pressure at sea level?

Answer 5

101kPa.

Question 6

What is the conversion of kPa to mmHg?

Answer 6

1kPa= 7.5mmHg
1mmHg= 0.133kPa
For example, 760mmHg= 760x0.133= 101.1kPa

Question 7

What is Dalton’s law?

Answer 7

The total pressure of a mixture of gases is equal to the sum of the partial pressures that each gas would exert in isolation.

Question 8

How to calculate partial pressure of a gas?

Answer 8

Partial pressure of gas= % of gas x atmospheric pressure.

Question 9

What happens to movement of gas as the pressure gradient increases?

Answer 9

Movement gets faster as the pressure gradient increases.

Question 10

What is Henry’s Law?

Answer 10

States that the number of molecules dissolving in liquid is directly proportional to the partial pressure at the surface of a gas.
P= kH.C

Question 11

What is the influence of water vapour pressure?

Answer 11

PH2O= 6.3kPa
Partial pressure of moist inspired O2= 20.9% x (barometric pressure- saturated water vapour pressure at 37 degrees.
Eg. PIO2= 0.209 x (101- 6.3) = 19.8kPa