When pressure is applied to fluid in an enclosed space, the fluid exerts

• A. The same pressure equally in all directions
• B. Varying pressures in different directions
• C. Pressure only in the direction of the force
• D. Increased pressure at the top

Answer: (A)

Pressure in a fluid at rest is transmitted equally in all directions. When you push on the fluid in a sealed space, that added pressure spreads through the entire fluid and acts on every surface perpendicular to it, not just in the direction you pushed. This isotropic, or direction-insensitive, behavior is what underpins hydraulic systems—the same pressure exists throughout the fluid regardless of direction or container shape. Gravity can make pressure increase with depth, but at a given point the pressure is the same in all directions, which is why it acts equally on every side.