A Course of Six Lectures on the Chemical History of a Candle: To which is Added a Lecture on PlatinumHarper & Brothers, 1861 - 215 pàgines |
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A Course of Six Lectures on the Chemical History of a Candle: To which is ... Michael Faraday Visualització completa - 1861 |
A Course of Six Lectures on the Chemical History of a Candle: To which is ... Michael Faraday Visualització completa - 1861 |
A Course of Six Lectures on the Chemical History of a Candle: To which is ... Michael Faraday Visualització completa - 1861 |
Frases i termes més freqüents
action antimony apparatus atmosphere beautiful beautifully blow blowpipe body boil bonic bottle bright bubbles bulk burnt bustion candle carbonic acid charcoal chemical chemical affinity coal-gas combustion condense contains copper cotton cubic foot curious duced examine experiment flame flask fluid fuel furnace gases give glass goes on burning gunpowder happens heat hold hydrogen ignited iridium iron filings kind lamp lead lecturer light lime lime-water melted metal mixture nitrogen obtained osmium oxide oxygen oxyhydrogen particles phosphorus pint plati platinum potassium produced PRODUCT OF COMBUSTION purpose pyrophorus quantity respiration result rhodium rise ruthenium smoke solid spermaceti steam stearin substance sulphuric sulphuric acid Suppose I take take a piece tallow taper tell thing tion tube vapor vessel voltaic battery weight wick wire zinc
Passatges populars
Pàgina 33 - ... brightest part; and here you see streaming upward the ascending current of hot air, as shown by Hooker, which draws out the flame, supplies it with air, and cools the sides of the cup of melted fuel. I can give you here a little farther illustration, for the purpose of showing you how flame goes up or down according to the current. I have here a flame — it is not a candle flame — but you can, no doubt, by...
Pàgina 37 - I suppose some here will have made for themselves the experiment I am going to show you. Am I right in supposing that any body here has played at snapdragon? I do not know a more beautiful illustration of the philosophy of flame, as to a certain part of its history, than the game of snapdragon. First, here is the dish; and let me say, that when you play snapdragon properly you ought to have the dish well warmed; you ought also to have warm plums, and warm brandy, which, however, I have not got. When...
Pàgina 167 - I must take you to a very interesting part of our subject — to the relation between the combustion of a candle and that living kind of combustion which goes on within us. In every one of us there is a living process of combustion going on very similar to that of a candle, and I must try to make that plain to you. For it is not merely true in a poetical sense — the relation of the life of man to a taper; and if you will follow, I think I can make this clear. In order to make the relation very...
Pàgina 81 - ... that if I were to send steam through that barrel it would be condensed, supposing the barrel were cold; it is therefore heated to perform the experiment I am now about to show you. I am going to send the steam through the barrel in small quantities, and you shall judge for yourselves, when you see it issue from the other end, whether it still remains steam. Steam is condensible into water, and when you lower the temperature of steam you convert it back into fluid water; but I have lowered the...
Pàgina 167 - For it is not merely true in a poetical sense — the relation of the life of man to a taper; and if you will follow, I think I can make this clear. In order to make the relation very plain, I have devised a little apparatus which we can soon build up before you. Here is a board and a groove cut in it, and I can close the groove at the top part by a little cover. I can then continue the groove as a channel by a glass tube at each end, there being a free passage through the whole. Suppose I take a...
Pàgina 42 - That is very different from what you have outside the flame ; and, in order to make that more clear to you, I am about to produce and set fire to a larger portion of this vapor; for what we have in the small way in a candle, to understand thoroughly, we must, as philosophers, produce in a larger way, if needful, that we may examine the different parts. And now Mr. Anderson will give me a source of heat, and I am about to show you what that vapor is. Here is some wax in a glass flask, and I am going...
Pàgina 20 - As the air comes to the candle, it moves upward by the force of the current which the heat of the candle produces, and it so cools all the sides of the wax, tallow, or fuel as to keep the edge much cooler than the part within; the part within melts by the flame that runs down the wick as far as it can go before it is extinguished, but the part on the outside does not melt. If I made a current in one direction, my cup would be lop-sided, and the fluid would consequently run over; for the same force...
Pàgina 86 - FIG. 70 things which in chemistry we call elements, because we can get nothing else out of them. A candle is not an elementary body, because we can get carbon out of it; we can get this hydrogen out of it, or at least out of the water which it supplies. And this gas has been so named hydrogen, because it is that element which, in association with another, generates water.* Mr. Anderson having now been able to get two or three jars of gas, we shall have a few experiments to make, and I want to show...
Pàgina 178 - As charcoal burns, it becomes a vapour and passes off into the atmosphere, which is the great vehicle, the great carrier for conveying it away to other places. Then, what becomes of it? Wonderful is it to find that the change produced by respiration, which seems so injurious to us (for we cannot breathe air twice over), is the very life and support of plants and vegetables that grow upon the surface of the earth. It is the same also under the surface, in the great bodies of water...
Pàgina 179 - This piece of wood gets all its carbon, as the trees and plants get theirs, from the atmosphere, which, as we have seen, carries away what is bad for us and at the same time good for them — what is disease to the one being health to the other. So are we made dependent not merely upon our fellow-creatures, but upon our fellow-existers, all Nature being tied together by the laws that make one part conduce to the good of another. There is another little point which I must mention before we draw to...