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wood prints heat wood prints temperature wood prints thermal wood prints beaker wood prints tube wood prints water wood prints hands wood prints chemical wood prints physical wood prints people wood prints thermal expansion wood prints expands wood prints heated wood prints warm wood prints warmed wood prints

photographs heat photos temperature photos thermal photos beaker photos tube photos water photos hands photos chemical photos physical photos people photos thermal expansion photos expands photos heated photos warm photos warmed photos

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Thermal expansion of air. A glass, bulb flask being held in someones hands, showing that air expands when heated. The heat from the person's hands warms the air in the flask. As the gas molecules heat up they gain energy enabling them to move around more. This increases the volume of the gas. As the volume increases, the pressure increases and the air is pushed through the tube (left). The air travels down the tube and bubbles out of the end through the water in the beaker (bottom left).

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