Methods of Purification
Simple Science
Methods of Purification
Water:
Water is improved by any of the following methods: -
(a) Boiling. The heat of boiling destroys animal and vegetable germs. Hence water that has been boiled a few minutes is safe to use. This is the most practical method of purification in the home, and is very efficient. The boiled water should be kept in clean, corked bottles; otherwise foreign substances from the atmosphere reënter the water, and the advantage gained from boiling is lost.
(b) Distillation. By this method pure water is obtained, but this method of purification cannot be used conveniently in the home.
(c) Filtration. In filtration, the water is forced through porcelain or other porous substances which allow the passage of water, but which hold back the minute foreign particles suspended in the water. The filters used in ordinary dwellings are of stone, asbestos, or charcoal. They are often valueless, because they soon become choked and cannot be properly cleaned.
The filtration plants owned and operated by large cities are usually safe; there is careful supervision of the filters, and frequent and effective cleanings are made. In many cities the filtration system is so good that private care of the water supply is unnecessary.
Printing
Fading Illumination
Strings and their Tones
The Gas Meter
Journeys Made by Molecules
The Character of the Air
A Battery of Cells
The Candle
The Value of Lenses
What Light Does for Us
Applications of the Lever
A Portable Barometer
Test your English Language
Benefits of Radicchio
What to Eat in Jammu and Kashmir
Myth about Apple
Dhirubhai Ambani
Know Tie Knots
Know World Carnival




