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The Particle Theory

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Particle Theory
Nature of Matter and Changes of State
The kinetic particle theory explains the properties of the different states of matter. The particles in solids, liquids and gases have different amounts of energy. They are arranged differently and move in different ways.

Solids
They have a fixed shape and cannot flow because the particles cannot move from place to place.
They cannot be compressed or squashed because the particles are close together and have no space to move into.

Liquids
They flow and take the shape of their container because the particles are free to move around each other.
They cannot be compressed or squashed because the particles are close together and have no space to move into.

Gases
They flow and completely fill their container because the particles can move quickly in all directions.
They can be compressed or squashed because the particles are far apart and have space to move into.



Changes of States of Matter
Freeze - Melt
Condense - Vaporize
Sublimate - Deposition
Factors affecting rate of evaporation
The rate of evaporation is affected by several factors including temperature, a breeze, dryness of surrounding air and surface area.

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