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Ts causes the crackling sound in a stove, when a firs- lighted? The expansion a varies. 9. Why is the warm one? The of the iron by the heat. tone of a steel wires piano higher in a cold room than lengthen in a warm room, and in so lower the tone. Ought an inkstand to have a large or a small mouth ? small mouth, to prevent evaporation. 10. A 1 Why is 1. there a space left between the ends of the rails on a railroad track ? To allow room for the expansion and contraction of the with the changes 12.

What causes the bubbles to rise to the surface, in hot tea ? when we put a lump of loaf-sugar The bubbles of air contained in the pores of the sugar because they are lighter than the water. 12. To what height can a balloon ascend? Until which it its specific gravity weight equal that of the air 13. is the same as that of the air in floats. What weight can A rise Why is it it lift? to the difference between its own weight and displaces. the air lighter in foul and heavier in fair weather ? This question reason is answered in the Philosophy.

31 grs. weigh ; hence 10 cu. will ft. 31 grs. 7652 avoirdupois. 3. What is the pressure of the air on one square 272/4 What x 144 x 15 Ibs. = rod of land? 588,060 Ibs. the pressure on a pair of Magdeburg hemispheres 4. 4 in. in diameter, when the air is entirely exhausted ? 1416 x 4 x 15 IbP. 5. 9 Ibs. How high the barometric a column of water can the air sustain when column stands at 28 in. 28 in. x l3'/ a 6. = If we should add a = 31 Vu feet. pressure of two atmospheres, what the bulk of 100 cu.

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Answers to the practical questions and problems in physiology, philosphy, astronomy and chemistry by J DORMAN STEELE

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