Amagat
Encyclopedia
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
molecule
s per unit volume at 1 atm
(= 101.325 kPa
) and 0 °C
(= 273.15 K). It is named after Emile Amagat
, who also has Amagat's law
named after him. The abbreviated form of amagat is "amg."
, is defined as
,
where n0 = 1 amg = 2.686 7774 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
,
where T0 = 273.15 K and p0 = 101.325 kPa
.
(20 °C
) and 1 atm (101.325 kPa) is
.
Number density
In physics, astronomy, and chemistry, number density is an intensive quantity used to describe the degree of concentration of countable objects in the three-dimensional physical space...
. Although it can be applied to any substance at any conditions, it is defined as the number of ideal gas
Ideal gas
An ideal gas is a theoretical gas composed of a set of randomly-moving, non-interacting point particles. The ideal gas concept is useful because it obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics.At normal conditions such as...
molecule
Molecule
A molecule is an electrically neutral group of at least two atoms held together by covalent chemical bonds. Molecules are distinguished from ions by their electrical charge...
s per unit volume at 1 atm
Atmosphere (unit)
The standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of pressure. For practical purposes it has been replaced by the bar which is 105 Pa...
(= 101.325 kPa
Pascal (unit)
The pascal is the SI derived unit of pressure, internal pressure, stress, Young's modulus and tensile strength, named after the French mathematician, physicist, inventor, writer, and philosopher Blaise Pascal. It is a measure of force per unit area, defined as one newton per square metre...
) and 0 °C
Celsius
Celsius is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius , who developed a similar temperature scale two years before his death...
(= 273.15 K). It is named after Emile Amagat
Emile Amagat
Emile Hilaire Amagat was a French physicist. His doctoral thesis, published in 1872, expanded on the work of Thomas Andrews, and included plots of the isotherms of carbon dioxide at high pressures...
, who also has Amagat's law
Amagat's law
Amagat's law or the Law of Partial Volumes of 1880 describes the behaviour and properties of mixtures of ideal gases...
named after him. The abbreviated form of amagat is "amg."
Definition
Number density in amg, denoted here by, is defined as ,where n0 = 1 amg = 2.686 7774 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
,where T0 = 273.15 K and p0 = 101.325 kPa
Pascal (unit)
The pascal is the SI derived unit of pressure, internal pressure, stress, Young's modulus and tensile strength, named after the French mathematician, physicist, inventor, writer, and philosopher Blaise Pascal. It is a measure of force per unit area, defined as one newton per square metre...
.
Example
Number density of an ideal gas (such as air) at room temperatureRoom temperature
-Comfort levels:The American Society of Heating, Refrigerating and Air-Conditioning Engineers has listings for suggested temperatures and air flow rates in different types of buildings and different environmental circumstances. For example, a single office in a building has an occupancy ratio per...
(20 °C
Celsius
Celsius is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius , who developed a similar temperature scale two years before his death...
) and 1 atm (101.325 kPa) is
.