Know that atom is the smallest unit of matter 10 know

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know that atom is the smallest unit of matter 10. know that a gas can be compressed and its pressure changes when it is compressed 11. acquire some knowledge of density 12. be familiar with the thermal expansion and contraction of solids, liquids and gases and some of their daily applications
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The more able students should 1. be able to explain the expansion and contraction of substances using the particle model 2. be able to explain the greater densities of solids when compared with liquids or gases using the particle model 3. be able to relate the different densities of hot and cold air to particle spacing
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