Pressure is the amount of force applied perpendicular to the surface of an object per unit area. It is a scalar quantity, defined as force/area/Gases/Pressure). Pressure can be measured relative to atmospheric pressure, which is called gauge pressure. The units of pressure are newtons per square meter, also called pascals or abbreviated as Pa.
To create a large amount of pressure, you can either exert a large force or exert a force over a small area (or do both) . For example, a knife cuts smoothly because the sharp edge has less surface area, resulting in greater pressure.
Pressure is not only applicable to solids but also to fluids (liquids or gases) . Atmospheric pressure, also known as air pressure, is the pressure exerted by the weight of air in the atmosphere.
In fluid dynamics, pressure energy is a term used in Bernoullis theorem, which states that the sum of kinetic energy, potential energy, and pressure energy per unit volume remains constant at any two points. The physical significance of pressure energy is that it is a measure of kinetic energy per unit volume.
