The meaning of the formula
If an object is pressed in one direction, it will produce a force opposite to the pressure, which is equal to the product of the pressure and the surface area of the object.
For example, if a balloon is squeezed between two flat plates, the balloon will be subjected to pressure in two directions, namely, the pressure of the flat plate on the balloon and the pressure of the gas inside the balloon on the balloon wall. These two pressures will produce two opposite forces, which are the force of the balloon on the plate and the force of the balloon wall on the gas. Both forces are equal to the product of pressure and balloon surface area.
This formula can be expressed mathematically as: F=PA.
Where f stands for force, p stands for pressure and a stands for area.
Application of pressure multiplied by area in life
1, hydraulic press
Hydraulic press is a mechanical device that uses liquid to transfer pressure. The hydraulic press has two pistons with different sizes, which are connected to a small container and a large container respectively. When a small pressure is applied in a small container, the liquid will transfer this pressure to a large container, thus generating a large pressure in the large container.
2, water gun
The water gun is a toy that sprays water. The water gun has a water tank and a nozzle. The water tank is filled with water and the nozzle is a small hole. When the trigger on the water gun is pressed, the water in the water tank will be squeezed out and a small and long-distance water flow will be sprayed through the nozzle. When the water is squeezed out, it will be pressed against the water wall by the air in the water tank, resulting in an outward force.
3. Aircraft
An airplane is a means of transportation that uses the principle of aerodynamics to fly. The plane has a pair of wings with airfoil structure, and there are some control surfaces with adjustable angles and shapes on the wings. When the plane moves in the air, the wing will cut the air, thus generating different pressures on the upper and lower surfaces of the wing.