Question

"what does solubility mean?" "process of"

Answer 1

Amount of a substance (called the solute) that dissolves in a unit volume of a liquid substance (called the solvent) to form a saturated solution under specified conditions of temperature and pressure. 
Solubility is expressed usually as moles of solute per 100 grams of solvent.

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Answer 2

Soluble:- Substances that dissolves in a given liquid.