metal

Home » metal

History of iron and blacksmithing – from iron to steel

By |2018-04-07T17:04:34+00:00September 7th, 2017|Science, West Asia|

History of iron: a Greek black-figure vase showing a blacksmith at work (Athens, about 550 BC) Why do people use iron? The history of iron doesn't start until much later than bronze. Iron is harder to form into metal than copper or bronze, because it needs a much hotter fire and a more complicated process. But if [...]

What is lead? A heavy kind of metal

By |2018-04-11T18:24:13+00:00September 6th, 2017|Religion, Romans, Science|

A Roman anchor from Palermo, Italy Lead is a kind of metal that is very heavy. (See if you can get some lead, like a fishing weight, to see how heavy it is). People have been mining lead and using it for weights in West Asia since about 4000 BC, about the same time people started to use copper, and before [...]

History of engineering – transportation, cooking, metal

By |2018-04-19T11:10:59+00:00September 5th, 2017|Science|

A Neanderthal stone awl People have been using engineering to solve the problems of their daily lives since the first caveman picked up a rock and chipped away at it to make a handaxe. That was in the Paleolithic, about 70,000 years ago. It is impossible to list all of the inventions that people have made since then, [...]

What is electricity? Physics

By |2018-06-01T10:27:39+00:00August 16th, 2017|Physics|

What is electricity? A bolt of lightning in the sky What is electricity made of? Everything in the universe is made of atoms.  Those atoms are made of electricity. Atoms are made of even smaller particles called protons, neutrons, and electrons. Electricity is electrons that have gotten loose from their atom. (More about electrons) The protons and neutrons [...]

What is rust? Oxidation reactions and chemistry

By |2018-09-25T20:07:38+00:00June 3rd, 2017|History|

What is rust? A rusty fence railing Oxidation reactions Fire isn't the only kind of combustion reaction. Some kinds of metal, if you leave them in contact with oxygen, will also react with the oxygen, but much more slowly, and without making a flame. Combustion reactions Lots of chemistry articles Because this reaction [...]

What is metal? Chemistry

By |2018-04-24T14:46:23+00:00June 2nd, 2017|Chemistry|

Copper ore in Iran Metals are atoms that attach themselves to other atoms in a particular way. Metal atoms, because of how their electrons are arranged, lose their electrons easily. When they join up with other atoms to make molecules, metal atoms join together by exchanging electrons. Because metal atoms join other metal [...]

What is tin? Atoms, elements, chemistry

By |2018-04-16T14:02:21+00:00June 2nd, 2017|Chemistry|

Like the other metals, tin is one of the heavier kinds of atoms. Every atom of tin has 50 protons and 69 neutrons in its nucleus (depending on the isotope; the exact kind of tin). Like other metals, all tin atoms form inside older stars that have become supernovas. On Earth, tin is very common. [...]

Lead fishing weights – Science project

By |2018-04-16T17:41:53+00:00June 1st, 2017|Chemistry|

Lead weights used for fishing How heavy is lead? See for yourself how heavy lead weights are. Go to a sports store and get some small lead fishing weights (make sure they are lead ones). Compare lead to other metals Now get some other kind of metal: pennies are made of mostly zinc and [...]

Rust and iron – Chemistry project

By |2017-06-01T22:24:46+00:00June 1st, 2017|Chemistry|

A rusty sign You can easily see that iron rusts and turns red when oxygen touches it. Go look around your backyard or your neighborhood and try to find ten things that are made of iron and have rusted. You might check cars, fences, old toys or tools left in the yard, nails, and [...]