Standard Temperature

[Avinash]

In certain cases we use 298K and in others we use 273K. Is there any way of remembering which is considered "standard" in certain situations?

[Jixe]

STP is 273K and 1 atm.

 

I think you use 298K when you're dealing with anything but gases or the PV=nRT equation. I think cells use the 298K reference.

[unknown user 7]

From my understanding, Standard Conditions and STP are two different things. They're values are different and one is used for gases and such and the other for enthalpy/ enthropy calcs.

 

Hopefully someone will correct this.

[unknown user 7]

I double checked, I was correct.

 

STP = 273 K and 1 atm

(enthalpy/ entropy)

 

BUT

 

Standard Conditions = 298 K

(gases)

[tallguy81]

In high school we learned:

 

STP: Standard Temperature and Pressure: 273K and 101.325 kPa (1 atm)

SATP: Standard Ambient Temperature and Pressure: 298K and 100kPa

[oohpsjin]

I double checked, I was correct.

 

STP = 273 K and 1 atm

(enthalpy/ entropy)

 

BUT

 

Standard Conditions = 298 K

(gases)

 

Indeed,

STP = 273 K and 1 atm

Standard Conditions = 298 K, 100 kPa

 

but, STP is the one we use for gases (PV=nRT)

and standard (ambient) conditions is the one we use for measuring standard enthalpy, entropy, free energy, voltage

[unknown user 7]

Maybe I should have added the word "generally."

However, I just double checked with my books and they seem to say the exact same thing I mentioned.

 

 

Meh. I guess it's for the OP to decide, what they will use.

[Avinash]

I think I will stick with 298 for most things, and use 273 for questions involving gases.