What is the phrase used for the equation of inward pressure?

• A. Bodily sinkage
• B. Inward force
• C. Pressure gradient
• D. Hydrostatic pressure

Answer: (A)

In fluid statics, the pressure inside a stationary liquid at a given depth is called hydrostatic pressure. This inward pressure increases with depth and is described by the equation p = ρ g h, where ρ is the fluid density, g is gravity, and h is the depth below the surface. Hydrostatic pressure is the standard term for the inward pressure you're calculating in a resting fluid. The other terms don’t fit: bodily sinkage isn’t a recognized fluid term; inward force is too generic; and a pressure gradient describes how pressure changes with position rather than the actual inward pressure at a specific depth.