Gassing


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gassing

[′gas·iŋ]
(electricity)
The evolution of gas in the form of small bubbles in a storage battery when charging continues after the battery has been completely charged.
(engineering)
Absorption of gas by a material.
Formation of gas pockets in a material.
Evolution of gas from a material during a process or procedure.
(textiles)

Gassing

 

in mines the escape of methane or other natural gas from layers of minerals and surrounding rock in underground workings. There are different types of gassing: ordinary gassing, fumarole gassing, and sudden gassing. Ordinary gassing takes place slowly but continuously from fissures and pores throughout the entire free surface in coal and rock; it increases when coal is separated from the main body. Fumarole gassing is the local liberation of gas from fissures, a fountain of gas that may be active for a long time. Sudden gassing consists of local, turbulent liberation of large quantities of gas for a short period of time, accompanied by destruction of the face. Gassing is controlled effectively by degasification of the minerals and surrounding rock.