Explore / Lower secondary (ages 11–14) / Science / The particle model
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- Solids, liquids and gasesNew: questions are written when you open itNew
- Changes of stateNew: questions are written when you open itNew
- DiffusionNew: questions are written when you open itNew
- Gas pressureNew: questions are written when you open itNew
- DensityNew: questions are written when you open itNew
- ExpansionNew: questions are written when you open itNew