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Clarification Regarding the conditions for STP 
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#1
Apr1214, 11:00 AM

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? Thanks. 


#2
Apr1214, 11:14 AM

Admin
P: 23,733

There is no one, universally accepted definition of STP. Bar is a recommended pressure for a standard state.



#3
Apr1214, 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.
Ref: http://goldbook.iupac.org/S05921.html (Getting a lot of mileage out of IUPAC today ) 


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