A text-book on chemistryFor the use of schools and colleges . e a drop of water be placed between two watch-glasses,and a little ether poured into the upper one, on puttingit under an exhausted receiver the ether will boil, andthe two glasses freeze together. The pulse-glass is an instrument which serves to il-lustrate the fact that evaporation is a cooling consists of a glass tube bent twice at right angles,and terminated by bulbs, asin Fig, 43, It is partiallyfilled with alcohol, the restbeing occupied by vapor ofthat substance. On grasp-ing one of the bulbs in the h
A text-book on chemistryFor the use of schools and colleges . e a drop of water be placed between two watch-glasses,and a little ether poured into the upper one, on puttingit under an exhausted receiver the ether will boil, andthe two glasses freeze together. The pulse-glass is an instrument which serves to il-lustrate the fact that evaporation is a cooling consists of a glass tube bent twice at right angles,and terminated by bulbs, asin Fig, 43, It is partiallyfilled with alcohol, the restbeing occupied by vapor ofthat substance. On grasp-ing one of the bulbs in the hand, the warmth is sufficientto boil the liquid, and as it distils over into the otherbulb an impression of cold is felt. The amount of watery vapor contained in the air isvery variable. Many common facts prove this. Theswelling of wooden furniture takes place in consequence Describe Leslies process for freezing water. Why docs liquidprussic acid solidify when exposed to the air? How may water befrozen by the aid of ether ? Describe the pulse-glass. Fig. 43. 62 HYGROMETERS.
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