"Pressure applied to an enclosed fluid is transmitted undiminished to every point of the fluid and to the walls of the container."

In simpler terms, this means that if you apply pressure to a fluid in a closed container, that pressure will be distributed evenly throughout the entire fluid and against the container's walls.

This principle has many practical applications, such as in hydraulic systems where a small force applied to a small area can be amplified to create a larger force over a larger area.