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What is the scientific justification for making Standard Temperature and Pressure certain data points?

According to NIST, STP is 68* F and 14.696 psi. Other organizations have their own. Is it a certain volume of a gas/solid/liquid?

Update:

Should have added this...Did someone take a gallon of water and it fit into a cubic foot box at a certain pressure/temp? Looking into why those numbers were chosen.

1 Answer

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  • 1 decade ago
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    For proper comparison across the world we need to set what room temp is .

    STP is 20oC which is 68oF or 293oK and 1 atm[atmosphere, sea level] air pressure, also expressed in psi or mmHg or Torr

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