Gases expand on heating . Comment
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Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid. However, gases that are contained in a fixed volume cannot expand - and so increases in temperature result in increases in pressure.
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Gas expands on heating because when we heat gas we provide more energy to atoms so as more energy they have fastest they vibrate and they go far from one another and as a result we say gas expands on heating
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