What happens to the pressure if the volume of a gas increases while temperature is held constant?

What happens to the pressure if the volume of a gas increases while temperature is held constant?

• A. Pressure increases
• B. Pressure decreases
• C. Pressure remains unchanged
• D. Pressure drops significantly

Answer: (B)

When the volume of a gas increases while the temperature remains constant, the pressure decreases. This relationship is described by Boyle's Law, which states that for a given mass of gas at constant temperature, the product of pressure and volume is constant. In mathematical terms, this can be expressed as P1V1 = P2V2, where P represents pressure and V represents volume at two different states. As the volume increases (meaning the gas is allowed to expand), the molecules have more space to move around, resulting in fewer collisions with the walls of the container. Since pressure is defined as the force exerted by gas molecules colliding with the surface area of a container, having fewer collisions means that the overall pressure exerted by the gas will decrease. This concept is crucial in understanding how gases behave under different conditions and is applicable in many practical scenarios, such as in air conditioning systems, where control of pressure and volume affects performance and efficiency.

When the volume of a gas increases while the temperature remains constant, the pressure decreases. This relationship is described by Boyle's Law, which states that for a given mass of gas at constant temperature, the product of pressure and volume is constant. In mathematical terms, this can be expressed as P1V1 = P2V2, where P represents pressure and V represents volume at two different states.

As the volume increases (meaning the gas is allowed to expand), the molecules have more space to move around, resulting in fewer collisions with the walls of the container. Since pressure is defined as the force exerted by gas molecules colliding with the surface area of a container, having fewer collisions means that the overall pressure exerted by the gas will decrease.

This concept is crucial in understanding how gases behave under different conditions and is applicable in many practical scenarios, such as in air conditioning systems, where control of pressure and volume affects performance and efficiency.