Duration: 01:27

Animations are used to show why mass does not change during a physical change.

Duration: 02:55

A practical demonstration of how liquids of different densities behave when they are mixed together.

Duration: 03:52

Animations and real life contexts are used to explain changes of state.

Duration: 01:52

A brief introduction to the mass of atoms, including gases, and how they vary in different elements.

Duration: 01:23

A team of British environmental campaigners have succeeded in driving to Greece in a car fuelled by nothing but cooking oil.

Duration: 02:22

A description of melting, evaporation and sublimation.

Duration: 00:48

An animation is used to demonstrate what you might see inside a liquid with a powerful microscope. What happens to the particles as the liquid is heated and it turns into a gas?

Duration: 01:43

A description of evaporation and condensation of water as it changes state.

Duration: 01:34

Liquid nitrogen is used to cool air and condense it into liquid form.

Duration: 05:06

Richard Craven of Unilever demonstrates how to make a bottle of super-concentrated detergent which saves hundreds of gallons of water.

Duration: 01:25

A demonstration of mass and volume changes that occur when a substance dissolves.

Duration: 02:00

A description of the particle arrangements in everyday substances - solids, liquids and gases.

Duration: 01:10

The galvanising process and how it creates a barrier against corrosion.

Duration: 02:00

A brief introduction to solids, liquids and gases, focussing on their properties.

Duration: 01:06

Salt is used to change the melting point of an ice cube.

A demonstration of how the solubility of most solids increases with temperature, whereas the solubility of most gases decreases as the temperature increases.

Duration: 04:19

Sealed bottles of water are supercooled and then frozen instantly using a mechanical trigger.

Duration: 02:38

The density of helium and sulphur hexafluoride are demonstrated with amusing effects on the human voice.