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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CONVERSATION IV., .-'V Qf the Attraction of Cohesion. 1'ATHER. I will now mention spme other instances of this great law of nature. If two polished plates of marble, or brass, be put together, with a little oil between them to fill up the pores in their surfaces, they will cohere so powerfully as to require a very considerable force to separate them. ?Two globules of quicksilver placed very near to each other, will run together and form one large drop.?Drops of water will do the same.?Two circular pieces of cork placed upon water at about an inch distant will run together.?Balance a piece of smooth board on the end of a scale beam; then let it lie fiat on water, and five or six times its own weight will be required to separate it from the water. If a emailglobule of quicksilver be laid on clean paperi and a piece of glass be brought into contact with it, the mercury will adhere to it, and be drawn away from the paper. But bring a larger globule -into contact with the smaller one, and it will forsake the glass? and unite with the other quicksilver. s Charles. Did not you tell me that it wa$ by means of the attraction of cohesion, that the little tea which is generally left at the bottom of the cup instantly ascends in the sugar when thrown into it ? Father. The ascent of water or other liquids in sugar, sponge, and ail porous bodies is a species of this attraction, and is called capillary attraction; it is thus denominated from the property which tubes of a very small bore, scarcely larger than to admit a hair, have of causing water to stand, above its level. Charles. Is this property visible in no other tubes than those, the bores of which are so exceedingly fine ? From capittvi, the Latin word for lutfr. Father. Yes, it is very apparent in tubes whose diame...
| ISBN-13 | 9780217044974 |
|---|---|
| ISBN-10 | 0217044972 |
| Weight | 0.77 Pounds |
| Dimensions | 9.00 x 6.00 x 0.53 In |
| List Price | $19.99 |
| Format | Paperback |
|---|---|
| Pages | 234 pages |
| Publisher | |
| Published On | 2009-08-01 |
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