# Solid

## Key Stage 2

### Meaning

Solid is a state of matter that holds its shape and cannot be squashed into a smaller space.

Solids can be described with texture.
 Cannot be poured. Hold their shape if you leave them alone. Do not flow.
 Solids cannot be squashed into a smaller size. You can change their shape by squashing, but their size stays the same.

Examples of solid materials:

• Brick
• Wood
• Plastic
• Glass
• Ice

## Key Stage 3

### Meaning

Solid is a state of matter where all the particles are in fixed positions, are touching and are in a regular arrangement.

 A solid cannot be poured because the particles are in fixed positions. Solids hold their shape if you leave them alone because the particles are in fixed positions. Solids do not flow because the particles are in fixed positions.
 Solids cannot be compressed into a smaller volume because the particles are already touching so they can't get any closer together.

## Key Stage 4

### Meaning

Solid is a state of matter where all the particles vibrate around fixed positions.

When a substance is in its solid state it is usually more dense than in its liquid or gaseous state. Ice is an exception to this due to how the molecules arrange themselves, see Ice-Water Anomaly.
A substance which is solid at room temperature has a larger force of attraction between particles than a substance which is liquid or gas at room temperature.
 Particle Diagram Particle Arrangement Property Particles are in fixed positions. Solids hold their shape. Convection cannot happen in solids. Particles are very close together. Solids cannot be compressed. Sound passes through solids faster than liquids and gases. Particles vibrate. Thermal Conduction happens best in solids.

### References

#### AQA

Solid, pages 82-5, 100-1, GCSE Physics; Student Book, Collins, AQA
Solids, page 107, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Solids, page 71, GCSE Physics, Hodder, AQA
Solids, page 97, GCSE Combined Science Trilogy; Physics, CGP, AQA
Solids, pages 121, 122, 193, 195, GCSE Combined Science; The Revision Guide, CGP, AQA
Solids, pages 164-5, 323, GCSE Combined Science Trilogy 1, Hodder, AQA
Solids, pages 36, 37, 107, GCSE Chemistry; The Revision Guide, CGP, AQA
Solids, pages 38-40, GCSE Physics; The Revision Guide, CGP, AQA
Solids, pages 6, 36-37, GCSE Chemistry; Third Edition, Oxford University Press, AQA
Solids, pages 76-79, 82, GCSE Physics; Third Edition, Oxford University Press, AQA
Solids, pages 97, 100, 101, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
Solids, pages 99, 102, 103, GCSE Chemistry, CGP, AQA
Solids; density of, pages 321-2, 323, GCSE Combined Science Trilogy 1, Hodder, AQA
Solids; density of, pages 69-70, GCSE Physics, Hodder, AQA
Solids; density, page 108, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Solids; density, page 98, GCSE Combined Science Trilogy; Physics, CGP, AQA

#### Edexcel

Solids, page 299, GCSE Physics, CGP, Edexcel
Solids, pages 34, 35, GCSE Chemistry; The Revision Guide, CGP, Edexcel
Solids, pages 95, 98, GCSE Chemistry, CGP, Edexcel
Solids, pages 97, 98 GCSE Combined Science; The Revision Guide, CGP, Edexcel

#### OCR

Solids, page 12, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR
Solids, page 14, Gateway GCSE Physics; The Revision Guide, CGP, OCR
Solids, pages 18, 19, 76-77, 123, 180-181, Gateway GCSE Chemistry, Oxford, OCR
Solids, pages 82, 152, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR