Brú Tiontaire {category}

The atmosphere is defined as the mean atmospheric pressure at sea level on Earth. It's a reference point for pressure scales and is commonly used in chemistry for gas law calculations.

The bar is a practical metric unit close to atmospheric pressure (1 atm ≈ 1.01325 bar). It's widely used across Europe and internationally for pressure gauges and specifications.

The inch of mercury is a unit of pressure based on the height of a column of mercury that the pressure can support. It's the standard unit for barometric pressure in US weather reports.

The inch of water is a unit of pressure based on the pressure exerted by a column of water one inch tall at 4°C (39.2°F). It's particularly useful for measuring small pressure differences in HVAC and medical applications.

The kilopascal is a practical metric unit for everyday pressure measurements. It's commonly used for tire pressures, blood pressure readings, and weather data in most countries.

The megapascal is used for measuring high pressures in industrial and engineering contexts. It's also used to express material strength and stress.

The millibar is the standard unit for expressing atmospheric pressure in meteorology and weather reporting. Atmospheric pressure at sea level is approximately 1013.25 mbar.

The millimeter of mercury is a unit of pressure based on the pressure exerted by a 1 mm tall column of mercury at 0°C. It's the standard unit for blood pressure measurement worldwide.

The pascal is the SI unit of pressure named after French mathematician and physicist Blaise Pascal. It's the standard unit in physics and engineering but is rarely used for everyday measurements.

The pound per square foot is used in construction and structural engineering for calculating loads and stresses on building materials and structures.

The psi is the standard pressure unit in the United States, appearing on tire pressure gauges, pressure relief valves, and industrial equipment throughout North America.

The torr is named after Evangelista Torricelli and is defined as 1/760 of an atmosphere. It's historically used for vacuum measurements and remains common in physics labs.