gastryk

Gastryk, or gas pressure, is the force per unit area exerted by gas molecules on surfaces they touch. It results from the collective motion and collisions of gas particles and is a fundamental property in thermodynamics. In a sealed container the pressure is typically uniform, aside from minor gradients caused by flow.

Pressure can be described as absolute, gauge, or differential. Absolute pressure is measured relative to a vacuum; gauge pressure is above atmospheric pressure; differential pressure is the difference between two pressures. The SI unit is the pascal (Pa); common units include kilopascals (kPa), bars, and atmospheres. For reference, 1 atm ≈ 101,325 Pa and 1 bar = 100,000 Pa.

Measurement employs devices such as manometers, Bourdon-tube gauges, diaphragms, bellows, and electronic pressure sensors. Low pressures are often read with fluid-column manometers or microtransducers; higher pressures use robust gauges and regulators. The relation pV = nRT describes gas behavior under suitable conditions (the ideal gas law).

Gastryk has wide practical relevance. It governs natural gas supply, compressed-air systems, tire and vehicle pressures, laboratory experiments, and many industrial processes. Safe operation requires proper regulation, leak detection, and adherence to standards to prevent overpressure and gas leaks.