Final answer:
Pascal's principle states that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container.
Step-by-step explanation:
Pascal's principle, also known as Pascal's law, states that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container. This means that when pressure is applied to a fluid, the pressure is distributed equally throughout the fluid. For example, if you squeeze a balloon filled with water, the pressure you apply to one part of the balloon will be transmitted to all other parts of the water inside the balloon.