Tables of Physical and Chemical Constants; And Some Mathematical Functions
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...all conform very nearly to this definition. When a pyrometer is sighted upon a body which is not "black," the temperature recorded--the "black body" temperature--will be lower than the true temperature to an extent which increases with the reflecting power of the body, eg. if platinum and carbon have equal "black body" temperatures, their actual temperatures may differ by 18o or so at 1500. TEMPERATURE AND COLOUR OF FIRE Temp. of positive crater of electric arc 34000 C.; under pressure 3600 C. BOILING POINT! EFFECT OF PRESSURE ON BOILING POINTS Ip/tt is given as mm. Hg per degree C. for pressures not very far removed from 760 mm. The boiling point in absolute degrees C. of a substance under 760 mm. = / + cy(x--p)t + 273), where c is a constant for the substance, and / is the B.P. in degrees C. at the pressure p mm. The constant c is the same for chemically similar substances. (See Young, " Fractional Distillation." THERMAL CONDUCTIVITIES The thermal conductivity, k, is given below as the number of (gram) calories conducted per sq. cm. per sec. across a slab of the substance 1 cm. thick, having a temp.-gradient of i C. per cm., i.e. calorie cm.-1 sec.-1 temp.-1. To reduce to pound-calories per sq. inch per sec. across a slab 1 inch thick with a temp.-gradient of i C. per inch, the values below must be multiplied by o-oo56. (See Callendar, "Conduction of Heat," Encyc. Brit., and Winkelmann's " Handbuch der Physik." METAL8 AND ALLOYS k for most pure metals decreases with rise of temperature; the reverse appears to be true for alloys. If K be the electrical conductivity and 0 the absolute temp., then k(K9) is very approximately a constant for pure metals. (See J. J. Thomson, ...
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- 13 Sep 2013
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