Definitions - u

U-value

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Underfloor Heating

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Underground Injection

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Unfinished Oils

All oils requiring further refinery processing, except those requiring only mechanical blending. Includes naphtha and lighter oils, kerosene and light gas oils, heavy gas oils, and residuum.

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Uniform Region

A territory with one or more features present throughout and absent or unimportant elsewhere.

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Upgradeable Product

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Upwelling

The upward flow of cold, nutrient-rich water toward the ocean surface as currents or seasonal winds draw warmer water away from a coast. Phytoplankton that feed in upwellings often support huge fish populations.

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Urban Heat Island

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