- 行业: Government
- Number of terms: 22108
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A hard, dense type of coal, that is hard to break, clean to handle, difficult to ignite, and that burns with an intense flame and with the virtual absence of smoke because it contains a high percentage of fixed carbon and a low percentage of volatile matter.
Industry:Energy
Two metals of different coefficients of expansion welded together so that the piece will bend in one direction when heated, and in the other when cooled, and can be used to open or close electrical circuits, as in thermostats.
Industry:Energy
The amount of heat given off by a person at rest in a comfortable environment; approximately 50 Btu per hour (Btu/h).
Industry:Energy
The conditioned or unconditioned space below the main living area or primary floor of a building.
Industry:Energy
Single-celled organisms, free-living or parasitic, that break down the wastes and bodies of dead organisms, making their components available for reuse by other organisms.
Industry:Energy
The conversion of one form of energy into another by the action of plants or microorganisms. The conversion of biomass to ethanol, methanol, or methane.
Industry:Energy
