# LIS IB Physics Thermal SL

## 12 terms

### (The) mole

the amount of a substance that contains as many elementary entities as the number of atoms in 12 g of the isotope carbon-12

### difference between evaporation and boiling (with reference to temperature)

evaporation takes place at any temperature/involves a reduction in temperature and boiling takes place at constant temperature

### difference between evaporation and boiling (with reference to surface area of a liquid)

evaporation takes place at the surface of the liquid/depends on surface area of the liquid and boiling takes place throughout the liquid/is independent of surface area

### temperature of an ideal gas

a measure of the molecules' average kinetic energy

### Internal energy

the total (potential energy and) kinetic energy of the molecules/ atoms/particles

### Heating

the (non-mechanical) transfer of energy (from the surroundings/source) to the object

### molar mass

The mass of one mole of a substance

in 1 mole of a substance, there are 6.02 x 10^23 particles of the substance

### specific heat capacity

the amount of energy required to raise the temperature of unit mass through 1 K

### thermal capacity

(thermal) energy required to change temperature by 1 K (or 1 deg C)

### specific latent heat

The quantity of energy required to convert a unit mass of a substance from one state to another at constant temperature and pressure

### pressure

The force per unit area of the particles colliding with the walls of the containing vessel