Here's why:

* Fluid Pressure: Liquids are fluids, which means they have no fixed shape and can flow. The molecules within a liquid are in constant motion, colliding with each other and with the container walls. This constant bombardment results in pressure, which is force distributed over an area.

* Pascal's Principle: This principle states that pressure applied to an enclosed fluid is transmitted undiminished to every point within the fluid. This means that the pressure from a liquid acts equally in all directions, even if the pressure is only applied from one direction.

Examples:

* Water pressure in a pool: The pressure at the bottom of a pool is greater than at the surface because the weight of the water above exerts pressure downwards. However, this pressure acts in all directions, pushing outwards on the pool walls and upwards on the bottom.

* A balloon filled with water: The water inside the balloon exerts pressure on the balloon's rubber walls, which is why the balloon expands. This pressure is distributed evenly throughout the balloon, not just in the direction the water was initially poured.

Let me know if you have any other questions!