Re: what is pascals principle

Pascals Principle has to do with the pressure in liquids and how pressure 
at one point relates to the pressure at other points in the liquid. The 
principle goes something like:

"Any change in the pressure applied to a completely enclosed fluid is
transmitted undiminished to all parts of the fluid and the enclosing walls"

This is the basis for hydraulic engines - typically engines based on oil or 
other liquids in cylinders with a piston that can slide back and forth. If 
you increase the pressure of the liquid (with a pump for instance) the 
liquid will push against the piston (and the sides of the cylinder) and as 
the piston can move it will slide and can then be used to push against 
other parts of a machine, as in a digging machine or various cranes.