Pressure is defined as the force per unit area acting on a surface. It is typically measured in units of Pascals or Newtons per square meter.
Pressure is directly proportional to mass density, meaning that as the mass density increases, so does the pressure. This is because a greater mass density indicates a greater amount of particles in a given area, resulting in more collisions and therefore more pressure.
Pressure can cause objects to compress or deform, depending on the material and the amount of force applied. For example, a balloon will expand or burst if there is too much pressure from the air inside.
The formula for pressure is pressure = force/area. This means that to increase pressure, you can either increase the force applied or decrease the area over which the force is applied.
Pressure can be measured using various instruments such as a barometer, manometer, or pressure gauge. These instruments typically use the units of Pascals, but other units such as atmospheres or pounds per square inch may also be used.