circulation heater
21Radiator (engine cooling) — For other uses, see Radiator (disambiguation). A typical engine coolant radiator used in an automobile Radiators are used for cooling internal combustion engines, mainly in automobiles but also in piston engined aircraft, railway locomotives,… …
22Diving suit — Two divers, one wearing a 1 atmosphere diving suit and the other standard diving dress, preparing to explore the wreck of the RMS Lusitania, 1935 A diving suit is a garment or device designed to protect a diver from the underwater environment.… …
23Incubator (culture) — A Bacteriological incubator …
24Swimming pool sanitation — articleissues refimprove = January 2008 technical = August 2008Swimming pool sanitation refers to both visual clarity and levels of microflora, such as bacteria and viruses in swimming pools. The goal of sanitation is to prevent the spread of… …
25Auto-defrost — Auto defrost, automatic defrost or self defrosting is a technique which regularly defrosts the evaporator in a refrigerator or freezer. Appliances using this technique are often called frost free, frostless or no frost. Contents 1 Mechanism 2… …
26Orbiting Frog Otolith — A bullfrog (Rana catesbeiana), the species which travelled on the OFO A flight The Orbiting Frog Otolith (OFO) spacecraft …
27heating — I Process of raising the temperature of an enclosed space. Heat can be delivered by convection, radiation, and thermal conduction. With the exception of the ancient Romans, who developed a form of central heating, most cultures relied on direct… …
28Color of water — For the book by James McBride, see The Color of Water. Water portal …
29Mica — For other uses, see Mica (disambiguation). Rock with mica …
30Marine aquarium — See also: Reef aquarium A marine aquarium …
