Officer Aptitude Rating (OAR) Test 2025 – 400 Free Practice Questions to Pass the Exam

The principle that explains the increase in pressure with depth in a fluid is the Hydrostatic Pressure Principle. This principle states that the pressure exerted by a fluid in a state of rest increases with depth due to the weight of the fluid above it. The deeper you go into the fluid, the greater the weight of the liquid column above that point, which leads to an increase in pressure.

The Hydrostatic Pressure Principle can be mathematically represented by the equation \( P = \rho g h \), where \( P \) is the pressure, \( \rho \) is the density of the fluid, \( g \) is the acceleration due to gravity, and \( h \) is the depth. As depth increases, the pressure rises proportionally, which is a key concept in fluid mechanics and is fundamental in various applications, such as calculating the pressure at different depths in seas and large bodies of water.

In contrast to this principle, Archimedes' principle deals with buoyancy and the upward force experienced by an object submerged in a fluid. Pascal’s law describes how pressure is transmitted equally in all directions throughout an incompressible fluid. Bernoulli's principle relates to the conservation of energy in flowing fluids, indicating that an increase in the speed