Physics Of Gases Flashcards
What is Boyle’s Law?
Pressure is inversely proportional to volume
What makes the pressure of a gas higher?
The more frequent/harder the collisions between molecules
What is Charles’ law?
Pressure is proportional to absolute temperature
What is the universal gas law?
(PV)/(nRT) P = pressure of gas V = volume of gas n = moles of gas R = universal gas constant T = temperature of gas
What does the universal gas law allow?
Calculation of how volume will change as pressure and temperature changes
Partial pressure of oxygen in air?
21.1kPa
How do you work out the partial pressure of a gas?
Percentage x total pressure
What is the standard vapour pressure?
The pressure once molecules are leaving and entering water at the same rate
What does standard vapour pressure depend on?
Temperature only
When water evaporates, what pressure do they exert?
Vapour pressure
When gases dissolve, what do they exert?
Tension
Like pressure if water wasn’t there
What happens with tension and partial pressure of the gas in gas mixture at an equilibrium?
Tension = the partial pressure of the gas in gas mixture
What does gas tension indicate?
How readily the gas will LEAVE the liquid
What is solubility of a gas?
The amount of gas which enters the liquid to establish a particular tension
What equation links tension, content and solubility?
Content = solubility x tension
How do you work out total content?
Total content = reacted gas + dissolved gas
What is an example of when a gas reacts with a liquid in physiology?
When oxygen reacts with haemoglobin
Define tidal volume
The amount of air which enters the lungs during normal inhalation at rest
