INTRODUCTORY COURSE OF NATURAL PHILOSOPHY FOR THE USE OF SCHOOLS AND ACADEMICS, EDITED FROM GANOT'S POPULAR PHYSICS

by William Guy Peck

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. 1871 edition. ...a portion of the long branch. Л small quantity of ether is introduced into the short branch, when it at once rises to the lop, #, of this branch, At ordinary temperatures, the pressure of the external atmosphere exerted through the mercury, is sufficient to prevent the ether from forming vapor if, however, the tube is plunged into a vessel of water heated to 112, the ether will be converted into vapor and will occupy a certain portion, уЩ of the tube, holding in equilibrium the pressure of the atmosphere, together with the weight of the mercurial column whose height is AC. If the tube be withdrawn and allowed to cool, the vapor of ether will be condensed, and will appear as a liquid at //. If more heat be applied, it wilt again be converted into vapor, and the mercury wilt rise in the branch, 0, as long as any ether remains to be evaporated. This shows that the tension of the vapor augments with the temperature. This principle holds true for all kinds of vapor. The tension acquired by the va-;" por of water, or steam often becomes so great by being heated a to burst the strongest vessels, and thus is the cause of frightful accidents. when burned in a fire-place, is the expansion of the water in the pores, giving rise at last to an explosion. When a chestnut is roasted in the ashes, the moisture within the shell expands into Fig. 145. The cause of wood snapping ( 22?.) tttjjaïn the (périment showing the influence of pressure on mporhaHon. Why does uood map when burnedf Why eloes a chestnut snap when Masted t steam, and explodes with sufficient force to throw the mit from the tiro. Hence it is that a smalt puncture is usually made in the shell, which permits the escape of the steam and prevents...

100 pages, Paperback

First published October 1, 2007

About the author

1820-1892