. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). TEACHER'S LEAFLET NO. 14. A SUnnER SHOWER. RALPH S. TARR. RAINSTORM comes, the walks are wet and the roads are muddy. Then the sun breaks through the clouds and soon the walks are no longer damp and the mud of the road is dried. Where did the water come from and where has it gone ? Let us answer these questions. A kettle on the stove is forgotten and soon a cracking is heard ; the housewife jumps to her feet for the kettle is dry. The kettle was filled w
. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). TEACHER'S LEAFLET NO. 14. A SUnnER SHOWER. RALPH S. TARR. RAINSTORM comes, the walks are wet and the roads are muddy. Then the sun breaks through the clouds and soon the walks are no longer damp and the mud of the road is dried. Where did the water come from and where has it gone ? Let us answer these questions. A kettle on the stove is forgotten and soon a cracking is heard ; the housewife jumps to her feet for the kettle is dry. The kettle was filled with water, but it has all boiled away ; and where has it gone ? Surely into the air of the room, for it can be seen issuing as "steam" and then disappear- ing from view, as if by magic. The heat of the fire has changed the liquid water to a gas as invisible as the air itself. This gas is water vapor. Do you wish to prove that the water vapor is there, although unseen ? Then if the day is cool, watch the windoW' and notice the drops of water collect up- on it. Or if the day is warm, bring an ice cold glass or pitcher into the room and see the drops collect upon it (Fig. i). People sometimes say, when drops of water collect on a glass of cold water, that the glass is " sweating ; " but see if the same thing will not happen with a cold glass that does not contain water. These two simple observations teach us two very important facts : (i) That heat will change liquid water to an invisible vapor, or gas, which will float about in the air of a room ; and (2) that cold will cause some of the vapor to change back to liquid Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cornell University. Agricultural Experiment Station. Ithaca, N. Y. : The University
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