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If the temperature is constant, when pressure on a closed gas system increases, the volume of the gas decreases. When pressure decreases, volume increases. Gases such as air are elastic, they bounce back. (Boyle's law) In class we loaded books onto a sealed syringe of air. As we added books, the pressure increased and the gas volume decreased. As we removed books, the volume increased. Air is compressible and elastic. We did not change the temperature of the system. |
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When heat is applied to a closed gas system, the temperature increases because the molecules begin to move faster. Faster moving molecules try to expand the volume. If the volume can't increase, the pressure increases. If the volume is allowed to change, it will increase and pressure will remain unchanged. (Charles' and Gay-Lussac's law) In class we demonstrated this by heating up a soda bottle capped with a balloon. As the temperature increased inside the bottle, the air escaped from the bottle into the balloon demonstrating an increase in volume. We kept pressure constant. |
