btu content
71Greenhouse gas — Simple diagram of greenhouse effect. A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.[1] …
72Biogas — Swamp gas redirects here. For the obsolete theory of emanations from swamps causing disease, see Miasma theory of disease. Pipes carrying biogas (foreground), natural gas and condensate …
73Thermal conductivity — In physics, thermal conductivity, k, is the property of a material that indicates its ability to conduct heat. It appears primarily in Fourier s Law for heat conduction.First, we define heat conduction by the formula::: H=frac{Delta Q}{Delta t}=k …
74Kilowatt hour — KWH redirects here. For other uses, see KWH (disambiguation). Residential electricity meter located in Canada The kilowatt hour, or kilowatt hour, (symbol kW·h, kW h or kWh) is a unit of energy equal to 1000 watt hours or 3.6 megajoules …
75T-54/55 — Infobox Weapon name= T 54/55 caption= Polish T 55A, Poznań Citadel Museum of Arms () origin= Soviet Union type= Main battle tank is vehicle= yes is UK= yes service= 1947–present used by= wars= designer= Morozov (T 54), OKB 520 (T 54A and later)… …
76Mass–energy equivalence — E=MC2 redirects here. For other uses, see E=MC2 (disambiguation). 4 meter tall sculpture of Einstein s 1905 E = mc2 formula at the 2006 Walk of Ideas, Berlin, Germany In physics, mass–energy equivalence is the concept that the …
77Powder River Basin — The Powder River Basin The Powder River Basin is a geologic region in southeast Montana and northeast Wyoming, about 120 miles (190 km) east to west and 200 miles (320 km) north to south, known for its coal deposits. The region supplies …
78Wood pellet — Wood pellets are a type of wood fuel, generally made from compacted sawdust. They are usually produced as a byproduct of sawmilling and other wood transformation activities. The pellets are extremely dense and can be produced with a low humidity… …
79Underground coal gasification — (UCG) is an in situ gasification process carried out in non mined coal seams using injection and production wells drilled from the surface, which enables the coal to be converted into product gas. The process is flexible in operation and is… …
80Thermal efficiency — In thermodynamics, the thermal efficiency (eta {th} ,) is a dimensionless performance measure of a thermal device such as an internal combustion engine, a boiler, or a furnace, for example. The input, Q {in} ,, to the device is heat, or the heat… …
