Coal

Coal

Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Industry: Energy

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Coal

Hours under load

Energy; Coal

The hours the boiler is operating to drive the generator producing electricity.

Leaded gasoline

Energy; Coal

A fuel that contains more than0.05 gramme of lead per gallon or more than 0.005 gramme of phosphorus pergallon.

Household

Energy; Coal

A family, an individual, or a group of up to nine unrelated persons occupying the same housing unit. "Occupy" means that the housing unit is the person's usual or permanent place ofresidence.

Leaded premium gasoline

Energy; Coal

Gasoline having an antiknock index (R+M/2) greater than 90 and containing more than 0.05 grammes of lead or 0.005 grammes of phosphorus per gallon.

Household energy expenditures

Energy; Coal

The total amount of funds spent for energy consumed in, or delivered to, a housing unit during a given period of time.

Mean indoor temperature

Energy; Coal

The "usual" temperature. If different sections of the house are kept at different temperatures, the reported temperature is for the section where the people are. A thermostat setting is accepted if ...

Leaded regular gasoline

Energy; Coal

Gasoline having an antiknock index (R+M/2) greater than or equal to 87 and less than or equal to 90 and containing more than 0.05 grammes of lead or 0.005 grammes of phosphorus per gallon.