natural circulation
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Natural circulation — refers to the ability of a fluid in a system to circulate continuously, with gravity and changes in heat energy (temperature) being the only driving force. This force is known as thermal head or thermal driving head. A fluid system designed for… … Wikipedia
Natural circulation boiler — In a natural circulation boiler the circulation is achieved by the difference in density when the water in the boiler is heated. In natural circulation steam boilers the circulation of water is by convection currents, which are set up during the… … Wikipedia
Natural gas prices — at the Henry Hub in US Dollars per MBtu for the 2000 2010 decade. Natural gas prices, as with other commodity prices, are mainly driven by supply and demand fundamentals. However, natural gas prices may also be linked to the price of crude oil… … Wikipedia
Natural gas vehicle — NGV redirects here. For the art gallery in Melbourne, Australia, see National Gallery of Victoria. Fueling (Fiat Multipla) … Wikipedia
Natural scientific research in Canada — This article outlines the history of natural scientific research in Canada, including mathematics, physics, astronomy, space science, geology, oceanography, chemistry, biology, medical research and psychology. The social sciences are not treated… … Wikipedia
Natural disasters in China — China is one of the countries most affected by natural disasters. It had 5 of the world s top 10 deadliest natural disasters; the top 3 occurred in China: the 1931 China floods, death toll 3 million to 4 million, the 1887 Yellow River flood,… … Wikipedia
Circulation (architecture) — In the field of architecture, circulation refers to the way people move through and interact with a building.[1] In public buildings, circulation is of high importance; for example, in buildings such as museums, it is key to have a floor plan… … Wikipedia
Natural History (Pliny) — Naturalis Historia, 1669 edition, title page. The title at the top reads: Volume I of the Natural History of Gaius Plinius Secundus. The Natural History (Latin: Naturalis Historia) is an encyclopedia published circa AD 77–79 by Pliny the… … Wikipedia
Natural hoof care — Booted horse on a trail ride. (Horse is in a transition period where it cannot be ridden barefoot after shoe removal) Natural hoof care is the practice of keeping horses so that their hooves are worn down naturally and so do not suffer overgrowth … Wikipedia
Natural disasters in India — Disaster prone regions in India … Wikipedia
Natural Stress — Abiotic stress is stress produced by natural factors such as extreme temperatures, wind, drought, and salinity. Man doesn’t have much control over abiotic stresses. It is very important for humans to understand how stress factors affect plants… … Wikipedia
