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Three_quarter_ten About "air" (2 points with 2 valuations) Air is the mixture of gases that makes up the Earth's atmosphere. It is mostly nitrogen (about 78%) and oxygen (about 21%). We breathe air. |
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Three_quarter_ten About "Machine tool" (2 points with 2 valuations) A machine tool is a machine that serves as a tool in making things. Machine tools are diverse, but the common theme is toolpath control. » http://tool |
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Three_quarter_ten About "Stainless steel" (2 points with 2 valuations) Stainless steel (SS) is steel that is corrosion-resistant. Chromium is the main alloying element besides carbon. SS rusts hardly at all. » http://steel |
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Three_quarter_ten About "China" (1 point with 1 valuation) China is a country in Asia. It is one of the largest countries in both area and population. There are over 1 billion Chinese people. » http://country |
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Three_quarter_ten About "Iron" (1 point with 1 valuation) Iron (Fe) is a metallic element (element 26). Humans find it useful for making things. It is abundant. Steel is an alloy of iron and carbon. » http://metal |
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Three_quarter_ten About "twickit" (1 point with 1 valuation) Twickit is a useful site where many things are explained, each in a few words or sentences. The explanations are free and can be valuated. » http://knowledge |
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Three_quarter_ten About "Fire" (1 point with 1 valuation) Fire is a chemical reaction that typically involves heat, light, and flame. It is dangerous but also useful. Fire releases energy from fuel. » http://fuel |
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Three_quarter_ten About "Carbon" (1 point with 1 valuation) Carbon (C) is the element with atomic number 6. It is important to us because its chemical interactions are the basis of life as we know it. » http://element |
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Three_quarter_ten About "aluminum" (1 point with 1 valuation) Aluminum is a metallic element. It is the third most abundant element in Earth's crust. Its alloys are popular for making things with. |
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Three_quarter_ten About "Steel" (1 point with 1 valuation) Steel is an alloy of iron (usually 80 to 99%) and carbon (usually 0.1 to 1%). Some steels have other alloying elements, too. » http://metal |
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