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1 million British thermal units, or 1 dekatherm. Approximately equal to 1,000 cubic feet (Mcf) of natural gas.
- Browse Related Terms: 1 million British thermal units or 1 dekatherm (MMBtu), 1 million cubic feet (MMCF), dekatherm or decatherm (DTH), MCF, Therm
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1 million cubic feet (of gas), or 1,000 Mcf.
- Browse Related Terms: 1 million British thermal units or 1 dekatherm (MMBtu), 1 million cubic feet (MMCF), dekatherm or decatherm (DTH), MCF, Therm
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That area that would be covered by water during the 100-year flood event.
- Browse Related Terms: 100-year floodplain, Gross heating value (GHV), Head, Higher Heating Value (HHV), Historic floodplain, Moisture Content (MC), Moisture content, dry basis (MCDB), Moisture content, wet basis (MCWB), Net heating value (NHV), Thermal Efficiency, Ultimate analysis
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The area that would be inundated by water during a flood event, having a one-percent chance of being equaled or exceeded in magnitude, in any given year.
- Browse Related Terms: 100-year floodplain, Aquifer-unconfined, Artesian water (artesian pressure), Confined aquifer, Hydraulic gradient, Impoundment (surface), Rebound (of water levels), Recharge, Sole source aquifer, Transmissivity, Unconfined aquifer
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Prices for the next 12 months of consecutive natural gas futures trading contracts, usually starting with the nearest, or prompt, month.
- Browse Related Terms: 12-month strip, Arbitrage, Delivery Point(s), Financial transmission right, Forward price curve, Futures market, Henry Hub, Locational marginal price, long, Mark-to-market, Physical basis, Reference price, Short position, Spark spread, Uplift, West Texas Intermediate (WTI)
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Having an absence of life or living organisms.
- Browse Related Terms: Abiotic, anaerobic digestion, Bioassay, Biochemical conversion process, Bioconcentration, Biological oxidation, Biome, bioremediation, Biotechnology, Biotic, BOD5, Cellulase, Clone, Ecology, Ecosystem, Landfill gas, Methanogen, Organic, Organic level, PCB´s, Watershed
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Non-living or non-biological; includes chemical and physical environments and processes.
- Browse Related Terms: Abiotic, Anthropogenic emissions, Demand-side management, Direct effects, Ecosystem, Effects, Full-time equivalent (FTE), Indirect effects, NatureServe, Noise criteria, Reclamation, Stressors
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The ratio of the mass of water vapor to the volume occupied by a mixture of water vapor and dry air.
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A material that extracts one or more substances from a fluid (gas or liquid) medium on contact, and which changes physically and/or chemically in the process. The less volatile of the two working fluids in an absorption cooling device.
- Browse Related Terms: Absorbent, Bagasse, cellulose, Decomposition, diffusion, Flame Spread Classification, Fuel, Insulation, Masonry, Outgassing, phase change, Rammed Earth, Refuse-Derived Fuel (RDF)
The component of a solar thermal collector that absorbs solar radiation and converts it to heat, or, as in a solar photovoltaic device, the material that readily absorbs photons to generate charge carriers (free electrons or holes).
- Browse Related Terms: Absorber, Band Gap, Band Gap Energy, Charge Carrier, Charge Controller, Conduction Band, Diffusion Length, Diode, Donor, Dopant, Electrical Energy, electrolyte, Electron, Hole, Ion, Valence Band
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The passing of a substance or force into the body of another substance.
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A type of air cooling device that uses absorption cooling to cool interior spaces.
- Browse Related Terms: Absorption Chiller, Ceiling Fan, Chiller, Cooling Capacity, Cooling Load, Dehumidifier, Desiccant Cooling, Filter (air), Flat-Black Paint, Recirculated Air, Return Air, Sensible Cooling Effect, Unitary Air Conditioner
In reference to a solar energy conversion devices, the degree to which a substance will absorb solar energy. In a solar photovoltaic device, the factor by which photons are absorbed as they travel a unit distance through a material.
- Browse Related Terms: absorption coefficient, Heliochemical Process, One Sun, Sizing, Solar Simulator, spectrum
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A process in which cooling of an interior space is accomplished by the evaporation of a volatile fluid, which is then absorbed in a strong solution, then desorbed under pressure by a heat source, and then recondensed at a temperature high enough that the heat of condensation can be rejected to a exterior space.
- Browse Related Terms: Absorption Cooling, Compression Chiller, Condensate, Cooling Tower, Czochralski Process, Dendritic Web Technique, Desuperheater, District Energy, Heat Pump, Heliothermic, Nocturnal Cooling, Regenerative Cooling, Roof Pond, Solar Access or Rights, Swamp Cooler
A system in which a secondary fluid absorbs the refrigerant, releasing heat, then releases the refrigerant and reabsorbs the heat. Ammonia or water is used as the vapor in commercial absorption cycle systems, and water or lithium bromide is the absorber.
- Browse Related Terms: Absorption Refrigeration, absorptivity, aperture, Blackbody, Endothermic, Heat sink, Heat source, Heat Storage, Photobiological Hydrogen Production, Radiative Cooling, Selective Absorber, Selective Surface Coating, Solar Thermal Systems
In a solar thermal system, the ratio of solar energy striking the absorber that is absorbed by the absorber to that of solar energy striking a black body (perfect absorber) at the same temperature. The absorptivity of a material is numerically equal to its emissivity.
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- See Alternating current
- Browse Related Terms: AC, Alternating current (AC), Battery, Build-out capacity, Cadmium (Cd), DC, Direct current (DC), DNI, Electrolytes (battery), Gallium (Ga), Inverter, Irradiance, Photovoltaic (PV) cell, Power conditioning system (PCS)
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A measure of earthquake acceleration (i.e., shaking) on the ground surface expressed in g, the acceleration due to the Earth's gravity.
- Browse Related Terms: Acceleration (peak horizontal), Direct Normal Insolation (DNI), Earthquake, Excessive grades, Ground motion (shaking), Peak horizontal acceleration, Planetary boundary layer turbulence structure, Slope stability, Steep slopes, stolon, Surface water, Tsunami
Draws attention to special features or enhances the aesthetic qualities of an indoor or outdoor environment.
- Browse Related Terms: Accent lighting, Aerobic Bacteria, Anaerobic Bacteria, Composting, Composting Toilet, Diffuse Solar Radiation, Ecosystem, environment, Eutrophication, Microclimate, Wind Energy
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Gravel or dirt roads (rarely paved) that provide overland access to transmission line and pipeline rights-of-way (ROWs) and facilities for construction, inspection, maintenance, and decommissioning. Access roads have an average distance of 5 mi or less, have a nominal width of 15 ft, and exist within the center of a nominal 25-ft-wide ROW.
- Browse Related Terms: AADT, Access roads, Average Annual Daily Traffic (AADT), Climate, Glare, Low-income population, mean, Median household income, Median housing value, Milligauss (mG), Per capita income, Slip rate, Taxonomy
A self-contained housing unit incorporated within a single-family dwelling (not within accessory structures, except with a Special Permit) that is clearly a subordinate part of the single-family dwelling.
Mass Executive Office of Energy and Environmental Affairs (EEA) - Cite This Source - This Definition- Browse Related Terms: Accessory Dwelling Unit (ADU), Air Retarder/Barrier, Dome (Geodesic), Monolithic, Passive Solar Home, Slab, Sunspace, Super Insulated Houses