Heat: An Elementary Text-book Theoretical and Practical

University Press, 1904 - Heat - 230 pages

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Page 105 - ... that The volume of a given mass of gas at constant pressure is proportional to its absolute temperature.
Page 220 - The combustion of a gramme of coal produces 8000 units of heat. If an engine employs in pumping water one-tenth of the energy supplied to its boiler by the combustion of coal, find how much coal must be burnt in order to enable it to raise 5000 litres of water to a height of 10 metres. 6. Explain how the mechanical equivalent of heat may be-calculated from a knowledge of the specific heats of air at constant pressure and constant volume.
Page 34 - The ratio of the quantity of heat required to raise the temperature of a given mass of any substance 1° to the quantity of heat required to raise the temperature of an equal mass of water 1° is called the specific heat of the substance.
Page 51 - A ball of copper (Sp. heat = 0-092), whose mass is 5 Ibs. is heated in a furnace, and allowed to drop into a gallon of water at 10° C.; the temperature of the water rises to 50° C. ; find the temperature of the furnace. What are the objections to this method of measuring high temperatures? 23. A calorimeter of copper weighs 80 grammes and the specific heat of the copper is -092. It contains 100 grammes of water at 10° C. Steam at 100° C. is passed into it until the temperature rises to 80° C....
Page 33 - Specific Heat. The ratio of the quantity of heat required to raise the temperature of a given mass of any substance 1°...
Page 121 - ... illustrated every time a snowball is made. When the snow is too cold it •will not bind. When it is near its melting-point, comparatively little pressure is needed to make it melt ; on removing the pressure the water formed freezes again and the snow binds. This phenomenon is known as regelation. EXPERIMENT (27). To observe the effects of regelation. (1) Place two pieces of ice in water and press them strongly together ; remove the pressure ; the two pieces are frozen together. (2) Support a...
Page 136 - ... liquefy ether. Carbonic acid gas is therefore commonly, though not strictly, spoken of as a gas. 12O. Ebullition or Boiling. A reference to the Table on p. 130 shews that at the temperature of 100° C. the pressure of aqueous vapour is 760 mm. of mercury. Now the standard atmospheric pressure is 760 mm., and water is seen to boil at this pressure and temperature. Thus in this case water boils at the temperature at which the pressure of its vapour is equal to the pressure to which the liquid is...
Page 30 - HEAT. from 20° to 21°. Experiment shews however that this is very nearly the case, and so for most purposes we may take as a Heat Unit the quantity of heat required to raise 1 gramme of water 1° C. This same amount of heat is given out by 1 gramme of water in cooling 1° C.
Page 233 - Series., has the merit of being written by scholars who have taken the trouble to acquaint themselves with modern needs as well as with modern theories. " Conduction of Electricity through Gases. By JJ THOMSON, D.Sc., LL.D., Ph.D., FRS, Fellow of Trinity College and Cavendish Professor of Experimental Physics, Cambridge, Professor of Natural Philosophy at the Royal Institution, London.
Page 164 - ... grammes approximately. 142. Difference between thermal conductivity and rate of rise of temperature. When heat is applied to one end of a rod or bar the rate at which the temperature rises at any point does not depend only on the thermal conductivity, but also on the specific heat. The quantity of heat reaching the portion of the bar about the point in question will depend on the thermal conductivity only. The rise of temperature produced in a unit of volume is proportional to the quantity of...