• Define the term "partial pressure" and know how to calculate a gas partial pressure

Partial pressure of a gas reffers to its mmHg/kPa in a ful gasseous pressure system

so for example

a system may be 100mmHg fully and one aspect of it may make up 80mmHg so that aspects partial pressure would be equal to = 80mmHg

in order to calculate Partial Pressure you must know the gas’s composition in the system (by %)

then multiply this percentage by the systems FULL pressure this will then give you that induvidual components partial pressure ! examples follow, also note the definition stated below is known as Dalton’s Law of partial pressures (all below)

• Explain what factors determine how much gas dissolves in a liquid

The temperature, - High temperature reduces the solubility rate of gases in water.

Pressure of the gaseous solute, - high pressure increases the solubility of gases in water.

Nature of the solvent and solute particles - Lastly the chemical structure of a solute or solvent will influence the solubility of a gas in water due to the action of various forces of attraction between molecules.

• Explain what factors affect the diffusion of gases across the air-blood barrier, and the consequences of such factors on arterial blood gases