Physics C1

Question 1

Latent heat

Answer 1

energy transferred that has the effect of changing the physical state of a substance without changing its temperature.

Question 2

Vapour

Answer 2

is the name given to a gas that is at a sufficiently low temperature that it will change state to a liquid or solid if its pressure is increased sufficiently.
In other words, a gas below its critical temperature.

Question 3

Vaporisation

Answer 3

is the change of physical state from liquid to gas. The reverse process is condensation.

Question 4

Saturated vapour

Answer 4

is vapour that is in equilibrium with a liquid phase of the same substance. Any further compression causes more liquid to condense.
The vapour cannot exert a higher pressure at that temperature than its saturated vapour pressure (SVP).

Question 5

Fusion

Answer 5

(or melting) is the change of physical state from solid to liquid. The reverse process is freezing.

Question 6

Phase

Answer 6

a separate part of system which is not uniform throughout. For example, a mixture of ice and water is a two-phase system, but a solution of salt in water is a one-phase system.

Question 7

Triple point

Answer 7

the temperature and pressure at which all three phases: solid, liquid and vapour, can exist in equilibrium.

Question 8

Critical point

Answer 8

the temperature and pressure at which the density of the liquid and vapour phases become identical. Above that critical temperature, only a supercritical gas phase can exist.

Question 9

How do you converse Celsius to kelvin

Answer 9

0k = 273C
Kelvin = Celsius + 273