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2. Infrared heater - Wikipedia

   en.wikipedia.org/wiki/Infrared_heater

   Infrared heaters are usually classified by the wavelength they emit: Near infrared (NIR) or short-wave infrared heaters operate at high filament temperatures above 1,800 °C (3,270 °F) and when arranged in a field reach high power densities of some hundreds of kW/m 2. Their peak wavelength is well below the absorption spectrum for water ...

3. Electric heating - Wikipedia

   en.wikipedia.org/wiki/Electric_heating

   Economically, electric heat can be compared to other sources of home heating by multiplying the local cost per kilowatt hour for electricity by the number of kilowatts the heater uses. E.g.: 1500-watt heater at 12 cents per kilowatt hour 1.5×12=18 cents per hour. [14]

4. Rocket mass heater - Wikipedia

   en.wikipedia.org/wiki/Rocket_mass_heater

   Rocket mass heaters are developed from rocket stoves, a type of wood-burning stove, and masonry heaters. A primary design of a rocket mass heater consists of an insulated combustion chamber where fuel is burned with high efficiency at high temperature, and a large thermal mass in contact with the exhaust gases , which absorbs most of the ...

5. Hand warmer - Wikipedia

   en.wikipedia.org/wiki/Hand_warmer

   The hand and foot warmer was first patented by Jonathan T. Ellis of New Jersey in 1891, [1] though no evidence exists that it was ever produced. [2]The first commercially produced hand warmer was created by Japanese inventor Niichi Matoba.

6. Watt-hour per kilogram - Wikipedia

   en.wikipedia.org/wiki/Watt-hour_per_kilogram

   The watt, kilogram, joule, and the second are part of the International System of Units (SI). The hour is not, though it is accepted for use with the SI.Since a watt equals one joule per second and because one hour equals 3600 seconds, one watt-hour per kilogram can be expressed in SI units as 3600 joules per kilogram.

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!