Hydraulics allows machines to transmit force from one point to another using an incompressible fluid. In most cases, this also increases the force applied at one end for a given amount of effort. Hydraulics work on the same principle as the mechanical lever, a simple machine that functions like a seesaw

They are available as oil-in-water emulsions, water-in-oil (invert) emulsions, and water-glycol blends. Water-based fluids can provide suitable lubrication characteristics but must be monitored to avoid problems.