What does an increase in volume indicate about pressure in a system at equilibrium?

When considering a system at equilibrium, Boyle's Law indicates that, for a given amount of gas at constant temperature, an increase in volume results in a decrease in pressure. This is due to the inverse relationship between volume and pressure: as the volume of a gas increases, the gas molecules have more space to move around, leading to fewer collisions with the walls of the container, which ultimately causes the pressure to decrease.

In the context of Le Chatelier's Principle, if you were to increase the volume of a system at equilibrium, the equilibrium position may shift in response to alleviate that change. If the reaction involves gases, the equilibrium may shift towards the side with more moles of gas to increase the pressure back towards the original level. However, the immediate effect of increasing the volume is a decrease in pressure.

Thus, understanding these principles, the correct answer indicates that an increase in volume does indeed correlate with a decrease in pressure in a system at equilibrium.