Clip description Keywords
 Does mass change during a change of state?
Does mass change during a change of state?

Duration: 01:27

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

 
A practical demonstration of the relative densities of liquids
A practical demonstration of the relative densities of liquids

Duration: 02:55

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

 
Applications of changes of state
Applications of changes of state

Duration: 03:52

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

 
Atomic mass
Atomic mass

Duration: 01:52

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

 
Car powered by chip fat
Car powered by chip fat

Duration: 01:23

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

 
Changes of state
Changes of state

Duration: 02:22

A description of melting, evaporation and sublimation.

 
Changes of state - liquid to gas
Changes of state - liquid to gas

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?

 
Changes of the state of water
Changes of the state of water

Duration: 01:43

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

 
Condensing air into liquid form
Condensing air into liquid form

Duration: 01:34

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

 
Making concentrated fabric detergent
Making concentrated fabric detergent

Duration: 05:06

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

 
Mass and volume changes during dissolving
Mass and volume changes during dissolving

Duration: 01:25

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

 
Particle model
Particle model

Duration: 02:00

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

 
Preventing corrosion: galvanisation
Preventing corrosion: galvanisation

Duration: 01:10

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

 
Properties of solids, liquids and gases
Properties of solids, liquids and gases

Duration: 02:00

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

 
Salt changes the melting point of ice
Salt changes the melting point of ice

Duration: 01:06

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

 
Solubility
Solubility

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

 
Supercooling and instantaneous freezing
Supercooling and instantaneous freezing

Duration: 04:19

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

 
The effect of helium and sulphur hexafluoride on the human voice
The effect of helium and sulphur hexafluoride on the human voice

Duration: 02:38

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

 

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