[sania]

I read in gas processing industry the term Normal Cubic meter is used (Nm3) of gas,From normal i got an idea that normal means
A Normal Cubic Meter of a gas (Nm3) is the volume of that gas
measured under the standard conditions of 0 degrees Celsius,
and 1 atmosphere of pressure. As volume of a gas is inversely proportional to its pressure, and proportional to absolute temperature. How can we convert it in to room or process temperature. By using pv = nrt or some other method. how can we find the volume of gas. Want a detail answer from you. Thankyou
with kind regards

[Borek]

PV = nRT will do.

[sania]

One more thing where we use Compressibility factor in PV=nRT. I mean in which condition we use Z1 and Z2. Thankyou
With kind regards

[Montemayor]

Sania:

I understand you to say that you know the “Normal” volume of a gas and want to know the actual volume at a specific temperature and pressure (both different from “Normal” conditions).  If that is what you mean, then you can use the Ideal Gas Equation PV = nRT – but only if you know the molecular weight of the gas.  A more conventional method of converting the volume is to use the result of combing simultaneous equations:

V₂ = V₁ (Z₂/Z₁) (P₁/P₂) (T₂/T₁)

Where,
V₂ = gas volume at the new condition, m³;
V₁ = “Normal” gas volume, m³;
P₁ = 1.0 atm, absolute;
P₂ = pressure at the new condition, atm., absolute;
T₁ = 273 ^oK;
T₂ = absolute temperature at new condition, ^oK.

The above equation is derived dividing one of the following equations by the other:

P₂ V₂ = Z₂ n R T₂
P₁ V₁ = Z₁ n R T₁

I hope this helps you out.

[mbeychok]

Sania:

Art Montemayor's equation is perfectly correct.

But I would caution you on assuming that Normal conditions are always 0 degrees Celsius and 1 atmosphere. There is no universally accepted set of Standard or Normal temperature and pressure conditions.  I urge you to read this article:

http://en.wikipedia.org/wiki/Standard_conditions_for_temperature_and_pressure

For example, as  you will see in the above article, the International Union of Pure and Applied Chemistry (IUPAC) defines the standard conditions of temperature and pressure as 0 degrees Celsius and 100 kPa which is 1 bar (not 1 atmosphere) and has done so for a good many years.

[technologist]

U can also refer my post

http://profmaster.blogspot.com/2007/07/suction-vs-discharge-gas-flow.html