Bunsen absorption coefficient

The Bunsen absorption coefficient , also Bunsen coefficient or Bunsen absorption coefficient ( symbol : or ), is a dimensionless number of physical chemistry named after the chemist Robert Wilhelm Bunsen . It indicates which volume V _{G of} a gas is absorbed in the volume V _L of another substance at a partial pressure that corresponds to the standard pressure in the physical standard state . The Bunsen coefficient is of particular importance when determining the gas dissolving capacity of liquids as a function of the operating pressure , for example with fluids in hydraulics . ${\displaystyle \alpha }$ ${\displaystyle \alpha _{V}}$

The following applies in the standard state:

${\displaystyle \alpha ={\frac {V_{G}}{V_{L}}}}$

If the partial pressure deviates from the standard pressure, Dalton's law applies :

${\displaystyle V_{G}={V_{L}}\cdot {\frac {p}{p_{0}}}\cdot \alpha }$

With

• ${\displaystyle V_{G}}$ - Volume of the dissolved gas
• ${\displaystyle V_{L}}$ - volume of the solution
• ${\displaystyle p_{0}}$ - atmospheric pressure (standard pressure)
• ${\displaystyle p}$ - absolute pressure (partial pressure deviating from standard pressure)

Values ​​of selected liquids

liquid	Bun coefficient
water	2%
mineral oil	8-10%
Polyglycol water solution	3-4%
Phosphoric acid ester	8-9%
Chlorine aromatics	8-9%

Individual evidence

1. ↑ ^{a b c d e} Wolfgang Backé : Fundamentals of Oil Hydraulics, Institute for Hydraulic and Pneumatic Drives and Controls at RWTH Aachen University , 2nd edition 1974.
2. ↑ Bunsen coefficient in the universal dictionary on deacademic.com
3. ↑ ^{a b} Bussian absorption coefficient in the universal dictionary on deacademic.com

See also

• Ostwald coefficient
• Henry Law
• solubility
• Substance proportion