Is it possible to write pV=nRT as pV=mRT?

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SUMMARY

The discussion centers on the equation pV = mRT and its validity compared to the traditional ideal gas law pV = nRT. The user questions the use of pV = mRT in a hydrology class, where the teacher is likely using R specific to a particular gas. The correct formulation for density is pV = mRT/M, where M represents molar mass. This alternative representation is noted to be common in climate sciences, despite the user's skepticism.

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  • Understanding of the Ideal Gas Law
  • Familiarity with the concepts of molar mass and density
  • Knowledge of specific gas constants (R) for different gases
  • Basic principles of thermodynamics
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Students in hydrology, climate science researchers, and anyone studying thermodynamics or gas laws will benefit from this discussion.

superjose
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Hi people. I've been scratching my head for some time now...

My teacher of hydrology class keeps posting pV = mRT and I don't know why he is doing that.

He's trying to get the density of the air.

But I know it should go like this

pV =mRT/M...

Can someone clarify this for me?

:s

Thanks.
 
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Probably he is using R that is specific for a given gas. Nonsense if you ask me, but I have seen it done in climate sciences.
 
jedishrfu said:
Apparently its an alternative way of writing the formula given the mass:

http://crown.panam.edu/thermodynamics/homework/javascript/gaslaw1f.htm

and here:

http://www.roymech.co.uk/Related/Thermos/Thermos_Specific_heat.html

Borek said:
Probably he is using R that is specific for a given gas. Nonsense if you ask me, but I have seen it done in climate sciences.

Thanks a lot, it has solved my doubts! :D
 
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