. Elementary physics and chemistry: second stage. Science. AMOUNT OF WATER VAPOUR IN AIR. 29 What to do. Determination of proportion of moisture in air.—Obtain a piece of glass tubing about \ inch diameter and about 10 inches long. Fit a good cork into each end and push through each a piece of narrow glass tubing. Fill the tube' with pieces of calcium chloride and weigh the whole. Support the tube in the clamp of a retort stand and connect one end by means of an india-rubber tube to an aspirator. Allow the water to run out of the aspirator, when air will pass over the calcium chloride in the t
. Elementary physics and chemistry: second stage. Science. AMOUNT OF WATER VAPOUR IN AIR. 29 What to do. Determination of proportion of moisture in air.—Obtain a piece of glass tubing about \ inch diameter and about 10 inches long. Fit a good cork into each end and push through each a piece of narrow glass tubing. Fill the tube' with pieces of calcium chloride and weigh the whole. Support the tube in the clamp of a retort stand and connect one end by means of an india-rubber tube to an aspirator. Allow the water to run out of the aspirator, when air will pass over the calcium chloride in the tube. Measure the water which runs from the aspirator, and so determine the volume of air which passes through the tube. At the end of the experiment again weigh the tube and calcium chloride, and so find its increase in mass. Construction and use of a hygrometer. — Stand a lump of sugar and a lump of salt in a saucer containing a little ink and water. Notice that the liquid rises up the solids. Place the corner of a dry handkerchief in a glass of water. Notice the rise of the water along the threads of the handker- chief, which in time becomes wet over a large part. Also notice the rise of water up separate threads and narrow tubes. The tubes can be made by melting a piece of glass tubing in the flame of a labora- tory burner and then drawing it out. Take two precisely similar unmounted thermometers. Sim- ply hang one from a suitable support, such as the ring of a retort stand. Cover the bulb of the other with a square of mus- lin tied up round it to form a bag. The muslin is best tied just above the bulb by a piece of thread. To this piece of thread attach several other long pieces of thread and let them dip into a glass of water. When 1^.15 ih. uub ui unc uicrmo- meter is kept niuist, and the evapo- the muslm has got thoroughly ration of this moisture causes this J„.«„ „.^.^,^-,„« ,« -^^j:.,^^ „r thermometer to show a lower temper- damp, compare the readin
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