Amaga ( English amagat , denoted by amg , Am ) is a practical unit of particle concentration . Although it can be applied to any substance under any conditions, it is defined as the number of ideal gas molecules per unit volume at 1 atm (101325 Pa ) and a temperature of 0 ° C (273.15 K ). [1] Named after the scientist Emile Amagat ( fr. Emile Amagat ), who also has the law named after him Amag . [2]
Definition
Particle concentration in amg, denoted here 
-
,
where n 0 = 1 amg = 2.686 7805⋅10 25 m −3 = 44.615 036 mol / m 3 is the Loshmidt constant .
In practice, the concentration of ideal gas particles at pressure P and temperature T can be calculated [3]
- {\ displaystyle \ eta = \ left ({\ frac {p} {p_ {0}}} \ right) \ left ({\ frac {T_ {0}} {T}} \ right) \, {\ rm { amg}}}
,
where T 0 = 273.15 K and p 0 = 101.325 kPa .
Example
Particle concentration of an ideal gas (e.g. air) at room temperature (20 ° C ) and 1 atm (101.325 kPa)
-
.
Notes
- ↑ Hirschfelder, Joseph O .; Curtiss, Charles F. & Bird, R. Byron (1967), Molecular Theory of Gases and Liquids (Corrected printing ed.), John Wiley & Sons, Inc.
- ↑ VG Teifel. Methane and ammonia abundance in the atmosphere of Saturn (Eng.) // Astronomy Letters : journal. - 1976. - Vol. 2 .
- ↑ The absolute values of temperature and pressure, relative to absolute zero and vacuum, should be used in this formula.