When a gas is heated at constant pressure-

The correct answer is Both temperature and volume will increase.

Key Points

• When a gas is heated at constant pressure both temperature and volume will increase.
  • If the pressure of a gas is kept constant, then increasing its temperature will increase its volume.
  • This is called the thermal expansion of a gas, and is a process similar to the expansion of liquids and solids when heated (although their expansion is much less noticeable than that of a gas).

Important Points

• The ideal gas law is the equation of a hypothetical ideal gas.
  • Although it has several limitations, It is a good approximation of the behavior of many gases under many conditions.