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# Density Water at STP (US)

vCalc.Density Water at STP (US)

The **Density of Water at Standard Temperature and Pressure** is 62.316 lbs/ft ^{3}. This is used as a reference substance for defining Specific Gravity. The Density of Water at Standard Temperature and Pressure (STP) is 998.2071 kg/m^{3} in SI units.

#### Related Calculators

- Pore Water Pressure
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- Snow or Water Density
- Water Density by Temperature
- Compute the Depth of Water associated with a Pressure

#### The Math / Science

NIST uses a temperature of 20 C (293.15 K, 68 F) and an absolute pressure of 101.325 kPa (14.696 psi, 1 atm).

The International Standard Metric Conditions for natural gas and similar fluids are 288.15 K (59.00 F; 15.00 C) and 101.325 kPa.[2]

In chemistry, IUPAC established standard temperature and pressure (informally abbreviated as STP) as a temperature of 273.15 K (0 C, 32 F) and an absolute pressure of 100 kPa (14.504 psi, 0.987 atm, 1 bar).[1] An unofficial, but commonly used standard is standard ambient temperature and pressure (SATP) as a temperature of 298.15 K (25 C, 77 F) and an absolute pressure of 100 kPa (14.504 psi, 0.987 atm). The STP and the SATP should not be confused with the standard state commonly used in thermodynamic evaluations of the Gibbs energy of a reaction.