• Avogadro’s law states that the volume of a gas is directly proportional to the number of moles of gas when the temperature and pressure are held constant.
  • If the container holding the gas is rigid rather than flexible, pressure can be substituted for volume in the equation.
  • Adding gas to a rigid container makes the pressure increase.
  • Since a relatively small amount of additional helium was added to the balloon, its volume increases slightly.
  • The volume of the balloon increases as you add mole of gas to it by blowing it up.
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