 | William Andrew Miller - Chemistry - 1867 - 550 pages
...effects of external changes of temperature. unit* of heat was ascertained ; since, by our definition, a unit of heat is the quantity of heat required to raise 1 gramme of water 1° C. The number of inches by which the mercurial column had advanced in the capillary... | |
 | William Lees - 1881 - 100 pages
...is necessary to adopt some standard or unit. It is customary in this country to adopt as the unit, the quantity of heat required to raise 1 Ib. of water 1° C. at the standard temperature. It is called the thermal unit. We infer, therefore, that if a certain... | |
 | Francis Campin - Mechanical engineering - 1881 - 290 pages
...verified by an examination into the difference of the theoretical and actual velocities of sound in air. The quantity of heat required to raise 1 Ib. of water 1° Fahrenheit is called one unit of heat, and for every unit of heat that disappears we have a right,... | |
 | Henry Adams - Mechanical engineering - 1883 - 164 pages
...motion of the particles of that mass. 163. MECHANICAL EQUIVALENT OF HEAT. British Thermal Unit, or unit of heat, is the quantity of heat required to raise 1 lb. of pure water, at its point of maximum density (=39-1° F.), through 1° P. Joule's Equivalent... | |
 | Alexander Ramsay - Mineralogy - 1885 - 436 pages
...and vapours, weighs '31 grain ; consequently water is about 816 times heavier than air. The English unit of heat is the quantity of heat required to raise 1 Ib. of water (weighed in vacuo, and at about 60° F.) from 60° to 61° F., which is equivalent to a force represented... | |
 | Henry Adams - Mechanical engineering - 1888 - 144 pages
...motion of the particles of that mass. 163. MECHANICAL EQUIVALENT OF HEAT. British Thermal Unit, or unit of heat, is the quantity of heat required to raise 1 Ib. of pure water, at its point of maximum density (=39-1° F.), through 1° F. Joule's Equivalent is the... | |
 | Henry Adams - Mechanical engineering - 1891 - 338 pages
...motion of the particles of that mass. 283. MECHANICAL EQUIVALENT OF HEAT. British Thermal Unit, or unit of heat, is the quantity of heat required to raise 1 Ib. of pure water, at its point of maximum density (=39-1° F.), through 1° F. Joule's Equivalent is the... | |
 | Walter Jones - Hot-water heating - 1894 - 254 pages
...high, this is termed 772 foot pounds, and is the mechanical equivalent of- heat. A French Caloric (or unit) of heat is the quantity of heat required to raise 1 Kilogramme (2-204 of water 1 Centigrade (1-8° Fahrenheit) in temperature, and is equal to 3-9683 British... | |
 | English periodicals - 1895 - 614 pages
...masses of liquid have been performed at the same temperature. Since J = 4'198 x 10' * ergs, when the unit of heat is " the quantity of heat required to raise 1 grin, of water through 1° 0. of the air-thermometer at 15° 0.," it follows that the results obtained... | |
 | Eugene Wycliffe Kerr - Force and energy - 1900 - 396 pages
...certain amount of work the same amount of heat will be produced. The unit of work is the foot-pound. The unit of heat is the quantity of heat required to raise 1 Ib. of water from 62° to 63° Fahrenheit. This is called a British Thermal Unit, or abbreviated, BTU According... | |
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A British thermal unit is the quantity of heat required to raise 1 Ib. of water 1° F. It ig equal to 0-252 kg.-cal. A kg.-cal. or 'great calorie' is the quantity of heat required to raise 1 kg. 
