Tag Archives: Metal

What is brass made of?

Brass is a yellowish metal made by melting copper and zinc together.  Brass is hard and strong and holds a bright finish.  Many of the metal things we use today are made of brass. Brass is a long wearing, yellowish-colored metal that is used in making such familiar things as brass doorknobs, pins and brass …

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Why does silver tarnished?

Silver is a shiny, white metal.  But unless polished on occasion, objects made of silver may soon lose their brightness and become coated with a dull film. When silver turns dark, we say it is tarnished.  Silver tarnishes for almost the same reason that iron gets rusty.  In fact, the word “tarnish” is used for …

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Where does platinum come from?

Perhaps you know someone who owns a ring with a platinum setting.  Platinum is a precious metal that looks like silver, but it is more valuable than gold. Its name comes from the Spanish word “platina”, which means “little silver”. Like silver and gold, it is usually mined in fairly pure form as little grains …

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Why does iron rust?

An iron nail left in a damp places will soon be covered by rust.  The rusting of iron is an example of oxidation.  That is, when iron rusts, it actually “burns up”.  But the rusting process is very slow and does not produce heat fast enough to cause a flame. In this process, the iron …

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What keeps the sun shining and how long can it continue to do so?

The Sun is a huge ball of extremely hot, glowing gases.  It is considered as the star nearest to the Earth.  It’s mass is equivalent to 333,420 earth. The surface temperature of the sun is estimated to be between 5 000 oC to 6 000 oC.  Temperature at the core is as high as 14 …

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What is a shooting star?

Shooting stars are tiny meteors that glow white hot when they hurtle from out of space into the earth’s atmosphere. If you look up at the sky long enough on a dark, clear night, you may see the fiery streak of a “shooting star” flash across the sky. While “shooting star” may be a pretty …

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