a) the pressure in the container will increase when a sample of gas is heated steadily in a closed rigid container.
Both the kinetic energy and the gas pressure will rise as a result. Typically, a rise in temperature will result in a rise in volume. The volume of the container cannot rise since the gas is contained inside a rigid container.
By definition, an increase in temperature results in an increase in kinetic energy. The gas's molecules will travel more quickly as a result of the increase in kinetic energy. The molecules smash more forcefully with one another as they move more quickly. Pressure will rise as a result of these encounters.
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