Amagat

Amagat

An amagat is a practical unit of number density. Although it can be applied to any substance at any conditions, it is defined as the number of ideal gas molecules per unit volume at 1 atm (= 101.325 kPa) and 0 °C (= 273.15 K).Citation
last = Hirschfelder
first = Joseph O.
author-link =
last2 = Curtiss
first2 = Charles F.
author2-link =
last3 = Bird
first3 = R. Byron
title = Molecular Theory of Gases and Liquids
publisher = John Wiley & Sons, Inc.
year = 1967
edition = Corrected printing
url =
doi =
id =
isbn = ] It is named after Emile Amagat, who also has Amagat's law named after him. The abbreviated form of amagat is "amg."

Definition

Number density in amg, denoted here by eta, is defined as:eta= frac{n}{n_0} ,

where "n"0 = 1 amg = 2.686 7774e|25 m−3 = 44.614 981 mol/m3 is the Loschmidt constant.

In practice, number density in amagat of an ideal gas at pressure "P" and temperature "T" can be calculated as [In this formula, absolute units of pressure and temperature, relative to vacuum and absolute zero, must be used.] :eta= left(frac{p}{p_0} ight)left(frac{T_0}{T} ight) ,where "T"0 = 273.15 K and "p"0 = 101.325 kPa.

Example

Number density of an ideal gas (such as air) at room temperature (20 °C) and 1 atm (101.325 kPa) is:eta= left(frac{1, atm}{p_0} ight)left(frac{273.15 K}{(273.15+20) K} ight)=0.932 { m amg}.

References


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