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Gas pressure is the force created when gas particles hit the wall of a container

Volume is the amount of space taken up by an object

Density is defined as the ratio between mass and volume or mass per unit volume

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http://www.bbc.co.uk/education/guides/zt6sfg8/revision/2

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Can you explain what's happening in words?

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http://www.bbc.co.uk/education/guides/z2wmxnb/activity

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http://www.bbc.co.uk/education/guides/z2wmxnb/revision/3

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http://www.bbc.co.uk/education/guides/zqwmxnb/revision/3

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http://www.bbc.co.uk/education/guides/zqwmxnb/revision

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http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/fundamentals/atomsact.shtml

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http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/atomic/atomstrucrev2.shtml