Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.


When subjected to sufficient pressure in a closed container, some gases become liquids at normal temperatures. Called liquified gases, common liquified gases include: anhydrous ammonia, chlorine, propane, nitrous oxide and carbon dioxide. Equilibrium inside the tank means that the contents exists in a liquid-vapor balance state. In contrast, some gases, called non-liquified gases, including oxygen, nitrogen, helium and argon, do not become liquid even at very high pressures. However, with lower temperatures as well as higher pressure, some gases, such as oxygen, can be converted to a liquid. The differences in these processes are used for scientific, industrial and commercial purposes. At or above its critical temperature, no amount of pressure will cause the gas to liquefy. The minimum pressure required to liquefy a gas at its critical temperature is called the critical pressure. When pressure is an essential part of the process, both the pressure and the temperature are controlled and monitored.

Carbon dioxide pressure-temperature phase diagram

Carbon dioxide pressure-temperature phase diagram. Source: Wikipedia.

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