A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . 10° 20° 30° + 40° 50° 60° 70° 80° 90° 100° 110° 150° 12. 190° * The megadyne is 1,000,000 dynes. To find, approximately, thepressure in cent
A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . 10° 20° 30° + 40° 50° 60° 70° 80° 90° 100° 110° 150° 12. 190° * The megadyne is 1,000,000 dynes. To find, approximately, thepressure in centimeters of mercury column, multiply the pressure inmegadynes per square centimeters by 75. 561 APPENDIX V. VALUE IN MILLIMETERS OF BROWN & SHARPE WIRE-GAUGE NUMBERS. Number. ^n^ 1 2 3 4 5 6 8 9 10 11 12 13 Number. »™£ 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 562 APPENDIX Fig. 310. Proof that ax = a2 {see § 272). In Fig. 310 each point of the line T1T1 represents by itsdistance from OP the volumewhich a given body of gas willhave, at temperature Tlf undera pressure indicated by theheight of the same point aboveOV; and the product pxvx is thesame for all points of this line(Boyles Law). TXTX is calledthe isothermal line Tx. T2T2 isanother isothermal, for the tern-perature T2, of the same body ofgas. The product p2v2, for this line, is also a constant. Let us suppose that the line TXTX is for 0° C. Let a cer-tain body of gas be at first in a condition indicated by thepoint a, in which condition we will call its pressure pa and itsvolume va. If this body of gas is heated at constant volumeto the temperature T2 at b, where its pressure may becalled pt,, we shall have, by the definition of ax (Exer. 41), P6=Pa[H-«1(272-!T1)], or pbva = p
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