medium volatile acids

See under non-volatile acids.

Term for all acids which, in contrast to volatile acids, do not pass into the gas phase due to stronger intermolecular forces and therefore remain completely in the wine. However, the boundary cannot be drawn exactly, as there are also "medium volatile acids". Non-volatile acids have an exclusively gustatory (taste) effect and have no olfactory (odour) perception, as they cannot evaporate.

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