Revised July, 2017
There are now 4 choices for
temperature and pressure.
Scroll to the bottom for instructions
For a simpler STP Calculator Click Here
To see how to do STP calculations, click here.|
Since gases do not have definite volumes, scientists have agreed upon
standard temperatures and pressures at which gas volumes can be compared.
1) Before 1982, the International Union of Pure and Applied Chemistry (IUPAC) defined standard temperature as
273.15 Kelvin (0° Celsius) and
standard pressure as 1 standard atmosphere (101,325 Pascals, 760.00 torr).
2) Since 1982, the IUPAC now defines
standard temperature as 273.15 Kelvin (0° Celsius) and
standard pressure as 0.98692 standard atmospheres, 100,000 Pascals, 750.06 torr
3) The National Institute of Standards and Technology (NIST) defines
Normal Temperature and Pressure (NTP) as
a temperature of 293.15 Kelvin (20° Celsius) and
a pressure of 1 standard atmosphere (101,325 Pascals, 760.00 torr)
4) Standard Ambient Temperature and Pressure (SATP) is defined as|
a temperature of 298.15 Kelvin (25° Celsius) and
a pressure of 0.98692 standard atmospheres, 100,000 Pascals, 750.06 torr
This calculator determines STP volume from data that can be input in a wide variety
of different units (8 volume units, 4 for temperature and 18 for pressure). It displays the
output in liters as well as 7 other volume units.
Also, it will display the number of
moles of gas based on 22.711 liters per mole.
Numbers are displayed in scientific format with the option to specify the precision by
inputting a number in the box above. For easy readability, numbers between .001 and
1,000 will not be displayed in scientific notation
Internet Explorer and most other browsers, will display the numbers properly but
there are a few browsers that will show no output whatsoever. If so, enter a zero
in the box above. This eliminates all formatting but it is better than seeing no
output at all.
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