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Elementary General Science

Elementary General Science


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...Water is found in the majority of things about us, the papers we use, the wood in our homes, the food we eat. For example, eggs and potatoes are three-quarters water, solid rocks contain water, and even our own bodies are 65 per cent water. Composition of Water.--Water is composed of two gases, hydrogen and oxygen. These gases are called elements. An element is a substance which can not be decomposed into simpler substances. Scientists have found that there are only about 83 different elements, but by combining them in different proportions various kinds of substances may be obtained. Thus by combining 2 parts of hydrogen with 1 part of oxygen, water is obtained. Electrolysis.--Water may be separated into its elements through a process called electrolysis. Water is poured into the bowl of the apparatus shown in the diagram until the two upright tubes are full of water. A little sulphuric acid is added, as the acid allows the current to pass through the water. A battery is attached to the two platinum sheets in the water at the bottom of the instrument. Bubbles of hydrogen will be seen to rise in one tube and bubbles of oxygen in the other. This process of separating the water into its elements to determine its composition is called electrolysis. Specific Gravity.--A knowledge of the density or specific gravity of a liquid or a solid is often important to determine the purity or condition of materials. In the preparation of syrups, jellies and other food products, the determination of their specific gravity is a very convenient way of knowing whether the process of evaporation or " boiling down " has been sufficient. The condition of milk as to its fat content may be determined by measuring the specific gravity of milk, which is from 1.028 to 1.032...


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Product Details
  • ISBN-13: 9781152645370
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 130
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1152645374
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 245 gr


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