Which principle states that pressure on a confined fluid is transmitted equally throughout that fluid?

Pascal's principle states that pressure applied to a confined fluid is transmitted undiminished in every direction throughout the fluid. This principle is fundamental in understanding how hydraulic systems work, as it illustrates that any change in pressure at any point in a confined fluid will affect all parts of that fluid equally. This concept is widely utilized in various applications, such as hydraulic brakes and lifts, where a small force can be multiplied to create a larger force.

In contrast, the hydrostatic principle refers to the pressure exerted by a fluid at rest. Bernoulli's principle deals with the relationship between the speed of a fluid and its pressure in dynamic systems, while Archimedes' principle relates to the buoyant force experienced by an object submerged in a fluid. These principles, while important in fluid mechanics, do not specifically address the equal transmission of pressure within a confined fluid.