What does Pascal's Principle state?

• A. Pressure changes in a fluid are not transmitted.
• B. A change in pressure is transmitted undiminished throughout an enclosed fluid.
• C. Liquid pressure increases with temperature.
• D. Pressure in gases is independent of volume.

Answer: (B)

Pascal's Principle, also known as Pascal's Law, states that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid. This means that if pressure is applied to one part of a confined fluid, it instantly affects the entire fluid uniformly. This principle is fundamental in understanding hydraulic systems, where small forces can be amplified into larger forces due to the transmission of pressure in the fluid. This underlies the operation of hydraulic lifts and brakes, where a small input force results in a much larger output force due to the continuous pressure throughout the fluid.

The other options do not accurately reflect Pascal's Principle. While it’s true that pressure in fluids can change with temperature, that is not a statement of Pascal's Principle. Additionally, while gas behavior is described by different gas laws, those statements do not embody the essence of Pascal's Principle, which focuses specifically on the transmission of pressure in a liquid or gas contained in a closed system.