gaugedruk
Gaugedruk, also known as gauge pressure, is the difference between the absolute pressure of a system and the local atmospheric pressure. It is a common way to express pressure, especially in industrial and engineering applications, because it directly relates to the force exerted by the fluid or gas within a system relative to its surroundings. Absolute pressure is the total pressure measured from a perfect vacuum, while atmospheric pressure is the pressure exerted by the Earth's atmosphere at a given location. Therefore, gaugedruk = absolute pressure - atmospheric pressure.
If a system's pressure is lower than the surrounding atmospheric pressure, the gaugedruk will be negative, and