Definitions

Question 1

Volatile

Answer 1

Evaporates easily

Question 2

Vaporisation

Answer 2

Some of the molecules on the surface of the liquid will move vertically and with enough speed to break free from the attraction of the other molecules in the liquid

Question 3

Vapour pressure

Answer 3

the pressure exerted by the vapour molecules above the liquid. Vapour pressure increases as the temperature of a liquid increases. Volatile anaesthetic agents have a high vapour pressure at normal temperatures

Question 4

Latent heat of vaporisation

Answer 4

Latent energy is the heat energy that is required to overcome the natural tendency of molecules of a liquid to adhere and allow for vaporisation. Heat is lost from the liquid as the vapour forms and this causes the temperature of the liquid to reduce which in turn leas to less vaporisation taking place

Question 5

Speed of vaporisation depends on

Answer 5

The properties of the liquid
The temperature of the liquid
The surface area available for vaporisation

Question 6

What is a vaporiser

Answer 6

A device which enables a specific concentration of anaesthetic agent to be added to a stream of carrier gas, i.e to oxygen and air or oxygen and N2)