Convert Millimeter of Water to Pascal (mmH2O to Pa)

Millimeter of Water (mmH2O) and Pascal (Pa) are both units of pressure. With the conversion form below, you can effortlessly and accurately convert millimeter of water to pascal. This free online calculator tool makes it simple and easy to perform the conversion from mmH2O unit to the Pa unit.

Pressure is the force applied perpendicular to a surface per unit area: P = F / A. The SI unit is the pascal (Pa), equal to one newton per square metre (1 Pa = 1 N/m²). Practical applications use larger units: the bar (1 bar = 100,000 Pa, close to standard atmospheric pressure), atmosphere (atm) (1 atm = 101,325 Pa), and psi (pounds per square inch, used in the US for tire and gas pressures). Blood pressure is measured in mmHg (millimetres of mercury), also called torr.

The millimeter of water (symbol: mmH₂O or mmH2O) is a non-SI unit of pressure defined as the pressure exerted by a one-millimeter column of water under standard gravity. It is commonly used in ventilation systems, clean rooms, HVAC engineering, and laboratory instruments to measure small pressure differences. Although the pascal is the SI unit of pressure, the millimeter of water remains a practical unit for low-pressure applications. It is based on the concept of a water column.

One millimeter of water is equal to 9.80665 pascals, 0.1 centimeter of water, 0.0000980665 bar, 0.00142233 pounds per square inch, and 0.00980665 kilopascal. The millimeter of water is widely used for measuring very low gas and liquid pressures.

A pascal (Pa) is the SI unit of pressure, equal to one newton per square metre (1 N/m²). Named after the French mathematician and physicist Blaise Pascal, the pascal measures the amount of force applied over a given area. It is the standard unit for pressure, stress, and elastic modulus in science, engineering, meteorology, and many industrial applications.

One pascal represents a relatively small amount of pressure, so larger multiples such as kilopascals (kPa), megapascals (MPa), and gigapascals (GPa) are commonly used in engineering and industry. The pascal is part of the International System of Units (SI) and provides a consistent standard for pressure measurements worldwide.

Pascals are widely used to measure atmospheric pressure, fluid pressure, tire pressure (often expressed in kilopascals), material strength, hydraulic systems, and engineering calculations. The unit also plays an important role in structural engineering, mechanical design, aerospace, and scientific research.