Convert Inch of water to Exapascal (inH2O to Exapascal)

Inch of water (inH2O) and Exapascal (Exapascal) are both units of pressure. With the conversion form below, you can effortlessly and accurately convert inch of water to exapascal. This free online calculator tool makes it simple and easy to perform the conversion from inH2O unit to the Exapascal 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 inch of water (symbol: inH₂O or inH2O) is a non-SI unit of pressure based on the pressure exerted by a one-inch column of water under standard gravity. It is commonly used in HVAC systems, ventilation, gas distribution, and fluid mechanics to measure low-pressure differences. Although the pascal is the SI unit of pressure, the inch of water remains widely used because it provides a convenient scale for low-pressure applications. More information is available in the inch of water reference.

One inch of water is equal to 249.089 pascals, 2.54 centimeters of water, 0.00249089 bar, 0.0361263 psi, and 0.249089 kilopascals. The inch of water is one of the most commonly used units for measuring low gas and air pressures.

The exapascal (symbol: EPa) is an SI-derived unit of pressure equal to one quintillion (10¹⁸) pascals. It is an extremely large pressure unit used primarily in theoretical physics, geophysics, astrophysics, and advanced scientific research involving exceptionally high pressures. The exapascal uses the SI prefix exa, representing a factor of 10¹⁸.

One exapascal is equal to 1,000 petapascals, 1,000,000 terapascals, 1,000,000,000 gigapascals, 10,000,000,000,000 bar, and 1×10¹⁸ pascals. Although rarely encountered outside research, the exapascal is part of the complete SI pressure scale.