General Science, First CourseD. C. Heath & Company, 1916 - 433 σελίδες |
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acid air pressure alcohol ammonia amount animals apple bacteria baking baking powder baking soda barometer body boiling bread burning called calories carbohydrates carbon dioxide carried cause cell cent chemical coal coil color compounds containing cool copper corn crops crystalline lens cubic cubic foot decaying disease earth eggs electric electromotive force energy engine escape evaporation eyes feet filter fire flow fruit fulcrum gases germs glass grains gram grow heat humus hydrogen inches iron keep kind larvæ lever light lines of force liquid machine magnet mechanical advantage mercury molecules move nitrogen objects one-celled oxidation oxygen pass pipes piston plants pole pounds produce protein pulley pump quantity QUESTIONS AND EXERCISES radiator roots salt seeds soap soda soil starch steam substance sugar surface temperature trees tube unit usually valve vessel warm weather weight wheel wood yeast zinc
Δημοφιλή αποσπάσματα
Σελίδα 418 - When a decimal number is to be divided by 10, 100, 1000, &c., remove the decimal point as many places to the left as there are ciphers in the divisor, and if there be not figures enough in the number, prefix ciphers.
Σελίδα 123 - CALORIE is the amount of heat required to raise the temperature of one kilogram of water one degree centigrade.
Σελίδα 7 - Masticate all food up to the point of involuntary swallowing, with the attention on the taste, not on the mastication. Food should simply be chewed and relished, with no thought of swallowing. There should be no more effort to prevent than to force swallowing. It will be found that if you attend only to the agreeable task of extracting the flavors of your food, Nature will take care of the swallowing, and this will become, like breathing, involuntary. The more you rely on instinct, the more normal,...
Σελίδα 419 - ... the action by which the surface of a liquid where it is in contact with a solid (as in a capillary tube) is elevated or depressed...
Σελίδα 78 - SPECIFIC HEAT The specific heat of a substance is the amount of heat necessary to raise the temperature of 1 pound of that substance 1 F.
Σελίδα 248 - Electricity is the name given to an invisible agent known to us only by the effects which it produces and by various manifestations called electrical These manifestations, at first obscure and even mysterious, are now well understood; though little is yet known of the precise nature of electricity itself. It is neither matter nor energy ; yet it apparently can be associated or combined with matter; and energy can be spent in moving it. Indeed its great...
Σελίδα 179 - ... unit work is done by unit force acting through unit distance. The force exerted by gravity upon a gram mass is 980 dynes. Therefore, to lift a gram mass one centimeter against gravity would require 980 ergs.
Σελίδα 246 - Gilbert made the great discovery that the compass-needle points north and south because the earth is itself also a great magnet. The magnetic poles of the earth are, however, not exactly at the geographical north and south poles. The magnetic north pole of the earth is more than I000 miles away from the actual pole, being in lat. 70° 5