effective heating area
61Snowmelt system — A snowmelt system is used to remove snow and ice via embedded electric cables or hydronic PEX tubing. Common areas for snowmelt systems are: driveways, walkways, parking areas, stairways, loading docks, and around car washes. A snowmelt system is …
62Compact fluorescent lamp — Low energy light bulb redirects here. For other low energy bulbs, see LED lamp. The tubular type compact fluorescent lamp is one of the most popular types in Europe …
63coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …
64Iran — /i ran , i rahn , uy ran /, n. a republic in SW Asia. 67,540,002; ab. 635,000 sq. mi. (1,644,650 sq. km). Cap.: Teheran. Formerly (until 1935), Persia. * * * Iran Introduction Iran Background: Known as Persia until 1935, Iran became an Islamic… …
65food preservation — Any method by which food is protected against spoilage by oxidation, bacteria, molds, and microorganisms. Traditional methods include dehydration, smoking, salting, controlled fermentation (including pickling), and candying; certain spices have… …
66Technological and industrial history of Canada — The technological and industrial history of Canada encompasses the country s development in the areas of transportation, communication, energy, materials, public works, public services (health care), domestic/consumer and defense technologies.… …
67Coal — Sedimentary Rock Anthracite coal Composition Primary carbon Secondary hydrogen, sulfur …
68Dornier Do 217 — Do 217 Do 217 E 2 Role Medium bomber Heavy bomber …
69Fouling — This article is about fouling in engineering. For uses of the term foul outside technology, see Foul (disambiguation). Not to be confused with fowling. Heat exchanger in a steam power plant, fouled by macro fouling …
70Chronology of world oil market events (1970-2005) — Basic OverviewThe 1970s See: 1970 1979 world oil market chronology 1970*January 1: U.S. Federal oil depletion allowance reduced from 27.5 to 22.0 percent. *May 3: TAP line from Saudi Arabia to the Mediterranean interrupted in Syria, creating all… …
