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Clarification Regarding the conditions for STP

by Conservation
Tags: clarification, conditions
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Apr12-14, 11:00 AM
Conservation's Avatar
P: 32
Hello all,

I am currently in possession of two chemistry textbooks, Changs and Atkins, which I believe are both fairly new versions. Changs defines STP at 25 degrees Celsius and 1 atm, and Atkins defines STP at 25 degrees Celsius and 1 bar; I understand that numerically it would not make a huge difference (1 atm=101.3 kpa=almost 100 kpa), but which is technically correct?

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Apr12-14, 11:14 AM
Borek's Avatar
P: 23,733
There is no one, universally accepted definition of STP. Bar is a recommended pressure for a standard state.
Apr12-14, 04:45 PM
P: 384
Atmospheres were used for something like 100 years until "they" decided to switch standard pressure to 1 bar. Numerically they are nearly identical, obviously.

(Getting a lot of mileage out of IUPAC today )

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