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Charles's Law


A sealed bulb is warmed with body heat from hands. The increase in pressure in the bulb increases, demonstrated as a column of water is displaced.


  • Charles Law apparatus
  • Large crystallizing dish
  • Warm water (or hands)


The gas inside the bulb can be expanded by using a warm water bath or simply by using your hands (vigorously rubbing your hands together will increase their heat). Make sure the system is closed before expanding the gas.