In simple terms, it is the result of the chemical reaction occurring in the liquid which produces a gaseous product.

A gas syringe can be used to measure gaseous products from a reaction.

These gaseous products bubble from the electrolyte and are collected.

The gaseous products of that reaction momentarily occupy the volume previously occupied by the solid explosive, but at very high pressure.

Along with the reaction or dissolution is the production of heat, and often with some gaseous product.

The samples are heated under experimental conditions such that the 'live' organic matter remaining in the coal is completely converted into gaseous products.

Transformations such as this are "driven" by entropy, the free energy gained upon the release of a gaseous product from a solid.

Such mixture, when ignited, generates moderate amount of heat and no gaseous products.

The gaseous products of complete reaction are typically carbon dioxide, steam, and nitrogen.

Carbon dioxide is a gaseous product of the body's metabolism and is normally expelled through the lungs.