Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...you mean the little bubbles of air that stick to the side of the glass? M. Yes, that is what I mean. When the cold water which is saturated with gas warms up, part of it must escape, and it does so in the form of bubbles, which gradually grow larger, and finally separate and rise. We have learnt something about the behaviour of oxygen when it is kept in a flask by itself, and when it is brought together with other bodies. Now we will get to know about it in the free state. P. I am curious to hear about that. M. You know that it is a constituent of air, and indeed the most active. The other constituent is called nitrogen, and animal life cannot survive in it, nor can flames burn in it, but go out. As air penetrates everywhere, so oxygen can penetrate everywhere, and it combines with substances which are present; that has happened as long as our earth has been in the same condition as it is now; that is, for thousands and thousands of years. The consequence is, that everywhere on the earth's surface compounds of oxygen are to be found. Most of the substances which we know contain oxygen. Compounds of other elements with oxygen are called oxides. The word oxygen comes from the Greek and means an acid substance. P. What has it to do with acid? It isn't acid, surely? M. It occurs in many acid substances. It was formerly believed that its presence was necessary to the existence of acid substances, but that has subsequently been found to be erroneous. P. Why did they keep the false name? M. Nobody thinks about it now, so it doesn't matter. But we will leave the name and go back to the thing. You know that by burning fuel we not only warm our houses in winter, but we drive our machines, lift weights, in fact, do all sorts of work that we require...
Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.
Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...you mean the little bubbles of air that stick to the side of the glass? M. Yes, that is what I mean. When the cold water which is saturated with gas warms up, part of it must escape, and it does so in the form of bubbles, which gradually grow larger, and finally separate and rise. We have learnt something about the behaviour of oxygen when it is kept in a flask by itself, and when it is brought together with other bodies. Now we will get to know about it in the free state. P. I am curious to hear about that. M. You know that it is a constituent of air, and indeed the most active. The other constituent is called nitrogen, and animal life cannot survive in it, nor can flames burn in it, but go out. As air penetrates everywhere, so oxygen can penetrate everywhere, and it combines with substances which are present; that has happened as long as our earth has been in the same condition as it is now; that is, for thousands and thousands of years. The consequence is, that everywhere on the earth's surface compounds of oxygen are to be found. Most of the substances which we know contain oxygen. Compounds of other elements with oxygen are called oxides. The word oxygen comes from the Greek and means an acid substance. P. What has it to do with acid? It isn't acid, surely? M. It occurs in many acid substances. It was formerly believed that its presence was necessary to the existence of acid substances, but that has subsequently been found to be erroneous. P. Why did they keep the false name? M. Nobody thinks about it now, so it doesn't matter. But we will leave the name and go back to the thing. You know that by burning fuel we not only warm our houses in winter, but we drive our machines, lift weights, in fact, do all sorts of work that we require...
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