hydraulics

Question 1

how compressible are liquids

Answer 1

liquids are virtually incompressible

Question 2

how is the pressure transmitted in a liquid (and what does this mean)

Answer 2

the pressure in a liquid is transmitted equally in all directions. this means that a force exerted at one point on a liquid will be transmitted to other points in the liquid.

Question 3

what is the relationship between pressure, force and cross sectional area

Answer 3

pressure = force / cross sectional area.  
P = F / A

Question 4

what enables a hydraulic system to be used as a force multiplier

Answer 4

the use of different cross-section areas on the effort and load side of a hydraulic system enables the system to be used as a force multiplier.