Question: a) b) When jam is made, it is put into the jam jar and the top screwed down whilst the jam is still hot.

a) b) When jam is made, it is put into the jam jar and the top screwed down whilst the jam is still hot. The

a) b) When jam is made, it is put into the jam jar and the top screwed down whilst the jam is still hot. The top makes an airtight seal with the jar and the air trapped above the jam cools and so the pressure of the trapped air reduces. 6 cm Trapped Air JAM

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