instantaneous gas factor
61Two-phase flow — In fluid mechanics, two phase flow occurs in a system containing gas and liquid with a meniscus separating the two phases. Historically, probably the most commonly studied cases of two phase flow are in large scale power systems. Coal and gas… …
62Demand response — This article is about the electrical concept. For the transport concept, see Demand responsive transport. A clothes dryer using a demand response switch to reduce peak demand In electricity grids, demand response (DR) is similar to dynamic demand …
63Energy (society) — The use of energy has been a key in the development of the human society by helping it to control and adapt to the environment. Managing the use of energy is inevitable in any functional society. In the industrialized world the development of… …
64Force — For other uses, see Force (disambiguation). See also: Forcing (disambiguation) Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate …
65Combo washer dryer — A closed cycle heat pump clothes dryer, using a heat pump to dehumidify the process air. Such dryers typically use less than half the energy per load of a condenser dryer. The washer is located below the dryer. A combo washer dryer (also known… …
66Spain — This article is about the country. For other uses, see Spain (disambiguation). Kingdom of Spain Reino de España …
67Time travel — This article details time travel itself. For other uses, see Time Traveler. Time travel is the concept of moving between different moments in time in a manner analogous to moving between different points in space, either sending objects (or in… …
68Engine knocking — Pinging redirects here. For other uses, see Ping (disambiguation). Knocking (also called knock, detonation, spark knock, pinging or pinking) in spark ignition internal combustion engines occurs when combustion of the air/fuel mixture in the… …
69Battle of Arras (1917) — Infobox Military Conflict conflict=Battle of Arras partof=the Western Front of World War I caption=The Town Square, Arras, France. February, 1919. date=9 April to 16 May, 1917 place=France casus= territory= result=No final breakthrough achieved… …
70Fictitious force — Classical mechanics Newton s Second Law History of classical mechanics  …
