Surface Tension of Water at STP

The Surface Temperature of Water at STP is 0.0757 N/m.

Standard Temperature and Pressure

The STP (temperature) is 273.15 degrees Kelvin (0 °C, 32°F).  The equivalent values of Standard Temperature are also:

• 0 °C
• 32 °F
• 491.67 °R (rankine)

The Math / Science

The Standard Temperature and Pressure (STP) is the combination of a standard temperature and a standard pressure used when measuring the density and other characteristics (e.g. solid, liquid or gaseous) for elements, chemicals, substances and other materials.

Because materials change state under different pressure and temperature conditions, an international standard coupling an easily measured absolute pressure and temperature was established known as STP, which is the abbreviation for Standard Temperature and Pressure.  Since 1982, STP is defined as:

1. 273.15 degrees Kelvin
2. 10⁵ Pascals of pressure