Environmental issues glossary

A glossary of words and phrases used in green construction and sustainable development.

V

Vapour barrier

The element in a wall, floor or ceiling that does not allow moisture or air to penetrate and is used to prevent condensation in insulation.

Vermiculite

A hydrous silicate of magnesium or iron which is expanded by heating to produce a lightweight fire resistant insulation.

Vertical expansion

Growth upwards from the base level of the land, for example high rise buildings.

Volatile organic compound (VOC)

A carbon-containing compound that vaporises at a relatively low temperature, generally below 40°C. VOCs can contaminate water, and in the atmosphere can react with other gases in the presence of sunlight to form ozone or other photochemical oxidants. They can generate ozone, a major factor in the formation of photochemical smog. 

Voluntary sustainability

Where city authorities, individuals and organisations choose to take measures to reduce negative effects on the environment and preserve it for future generations.

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