elevation noun [C/U]. âº âheight above the âsurface of the âearth, or an âarea that is âhigher than the âsurrounding âland: [C] At âhigher elevations, the âair is âcolder. (Definition of elevation from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
A dissolved gas is, simply enough, gas that has been dissolved into another material. This creates a solution, a mixture, where the gas is the solute, the minor component, and the other material, generally a liquid, is the solvent, the main component.
Sewer gas is a complex mixture of toxic and non-. toxic gases which collect in the sewage system at. varying levels depending on the source. Sewer gas. is formed during the decay of household and. industrial waste. Highly toxic components of sewer. gas include hydrogen sulfide and ammonia.