a clear colourless tasteless odourless liquid that is essential for plant and animal life and constitutes, in impure form, rain, oceans, rivers, lakes, etc. It is a neutral substance, an effective solvent for many compounds, and is used as a standard for many physical properties. Formula: H 2 O related adjective aqueous related combining_forms hydro- aqua-

liquid that has been passed through a filter.

The changing of a liquid into a gas, often under the influence of heat (as in the boiling of water).

The evaporation and subsequent collection of a liquid by condensation as a means of purification.

The process of separating different materials, especially minerals, by agitating a pulverized mixture of the materials with water, oil, and chemicals. Differential wetting of the suspended particles causes unwetted particles to be carried by air bubbles to the surface for collection.

the process of removing salt, esp from sea water so that it can be used for drinking or irrigation