Pressure = (Force/Area)
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Newton per m2 is equal to a Pascal Pascal's are a unit of pressure. If you think about it, the newton is force and the meters squared is area. Pressure is the measure of force per area.
Each tire supports 2100 N, and the pressure exerted by each tire is 20 N per centimeter2, so Pressure = Force / Area Pressure = 20 N per centimeter2 Force = 2100 N rearranging the equation for Area Area = Force / Pressure Area = 2100 / 20 = 105 centimeter2 So each tire has 105 cm2 touching the road.
To lift 1 ton (equal to 2,000 pounds) with a hydraulic system, you would need to apply 2,000 pounds of force. Since pressure is force divided by area, and the area of a typical hydraulic cylinder is around 1 square inch, you would need 2,000 pounds per square inch (psi) of pressure to lift 1 ton. In other words, you would need a hydraulic system capable of generating 2,000 psi to lift 1 ton.
The formula for the area of a square is s2 (sides squared)
Mass = Pressure*Area