A2 Unit 14 Temperature

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Define thermal equilibrium

For two or more regions of equal temperature, there is no net transfer of energy

Describe the absolute scale temperature

Does not depend on any physical property of a substance

What is meant by absolute zero?

0K. The temperature at which atoms have no energy

How do you convert between kelvin and degrees Celsius?

0℃ = 273.15K

Define specific heat capacity

The work done per unit mass required to raise the temperature of a substance by 1K without change in state

Define specific latent heat

The work done per unit mass required to change the state of a substance without change in temperature

Describe the difference between specific latent heat of fusion and specific latent heat of vaporisation

The specific latent heat of fusion is the work done per unit mass required to change state from solid to liquid whereas specific latent heat of vaporisation refers to the work done per unit mass required to change state from liquid to gas

Describe the difference between boiling and evaporation for a liquid

Evaporation occurs at any temperature above the melting point at the surface of the liquid and results in a cooling of the liquid. Boiling occurs at a specific temperature throughout the liquid and does not result in cooling.