The earth makes its own air in the sense that the composition of the atmosphere is always being changed by the things that happen at the surface of the solid earth or at the surface of the seas. Gases are passing into the atmosphere from...
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Does the earth make the air we breathe?
Where does our breath go?
All gases, when exposed to other gases, tend to get mixed with them, until, if nothing interferes the various gases are equally distributed or diffused. The breath we breathe out has much more carbon dioxide and also much more water vapour than ordinary air. They...
Why do we not see our Breath on a warm day?
Our Breath is warmer than the air outside. Sometimes the air outside is so warm that it does nothing in particular to that gaseous water or water in the form of a gas, which is al- ways in our breath; and so, we see nothing....
Why do we have bones in our bodies?
By their strength and resistance, bones form a supporting framework for our bodies, and prevent them from collapsing in a shapeless mass on the surface of the ground under the influence of gravitation.
Why does a towel dry one’s body?
The water on one’s body is absorbed in the tiny spaces between the fibres of the towel in the same way as ink is taken up by the blotting paper.
Why does blotting-paper absorb ink?
A very hard, very smoothly glazed paper will scarcely absorb any ink. But a paper of loose texture, with a rough, unfinished surface like blotting- paper, absorbs ink just as a sponge sucks up water; and the water of the ink, instead of mainly remaining...
What Bird is wingless and where does it live?
The Apteryx, or, as the natives call it, the Kiwi, is a peculiar bird with hardly any trace of wings. Found in New Zealand, where it was formerly very common, though now it is seen more rarely, it has a very long beak with nostrils...
What does a Bird sing about?
Whenever anybody sings naturally, it sings about its feelings. The birds only sing when they must-when their feelings find their way out somehow. The feelings that birds sing about are always happy feelings. When a bird is ill or miserable or unhappy it never sings....
Why have the eggs of birds so many colours?
A particular kind of bird always produces the same kind of colour in its eggs, first as it produces a particular kind of colour in its feathers. This is a result of the particular chemistry of the body of the bird. The difference in colour...
How can a bird fly though it is heavier than air?
Some force is produced which acts against gravitation and balances it when the bird maintains its level in the air, or more than balances it when the bird rises in the air. The necessary force is produced by burning the sugar in its muscles; in...
