atmosphere
The atmosphere is the gaseous layer surrounding a celestial body.
Glossary
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acids and bases
Acids are substances that cause a pH value of less than 7 in an aqueous solution. The pH of bases is between 7 and 14. Acids and bases usually react with one another in what is known as an acid-base reaction and can neutralise one another.
atmospheric deposition
Atmospheric deposition means the deposition of atmospheric air admixtures on natural and artificial surfaces.
aggregate
Aggregates are admixtures to potting soil (e.g., sand, loam, clay, crushed bricks, lime, algae lime, primary rock powder).
adiabatic
An adiabatic change of state is a thermodynamic process in which a system is transformed from one state to another without exchanging heat with its surroundings. It is therefore a thermally perfectly insulated system.