Category: Science & Technology
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How does a pressure cooker work?
Pressure cooker is a modern kitchen appliance that can cook almost any type of food in a very short time. It also saves a lot of fuel. Moreover, the nutritional constituents of the food are also not spoilt. Do you know how the pressure cooker helps in fast cooking? …
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What are radio waves?
Radio waves belong to the family of electromagnetic waves which owe their existence to moving electrons. The existence of radiowaves was first predicted by James Clerk Maxwell in 1860, but it was not until 1887 that Heinrich Hertz succeeded in producing them experimentally. “Wireless” telegraphy was first demonstrated by Sir…
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Why do stars twinkle?
We see millions of stars twinkling in the sky during night. They radiate their light in all the directions. Even though they appear very small yet in reality they are very big. Most of the stars are many times bigger than our earth. They look smaller only because of their…
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How does a microwave oven work?
Over the years application of modern technology in the domestic sphere has made our lives more comfortable and easier. Washing machines, vacuum cleaners, microwave ovens etc. are a few examples that meet the demands of the modern society of today. The new gifts of technology especially for household use, always…