directly as the air or gas density

inversely as square root of density

inversely as density

as square of density

ratio of diameters

square of ratio of diameters

inverse ratio of diameters

square of inverse ratio of diameters

two cylinders, two rams and a storage device

a cylinder and a ram

two co-axial rams and two cylinders

a cylinder, a piston, storage tank and control valve

two cylinders, two rams and a storage device

a cylinder and a ram

two co-axial rams and two cylinders

a cylinder, a piston, storage tank and control valve

accumulating oil

supplying large quantities of oil for very short duration

generally high pressures to operate hydraulic machines

supplying energy when main supply fails