Why Does Boiling Water Bubble?
Why Does Boiling Water Bubble? When you boil water in a teakettle, you heat it to the point where it changes from a liquid to an invisible water gas called...
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Why Does Iron Rust?
The metal iron combines chemically with oxygen when there is moisture in the air, and the result is the reddish substance we call rust. Iron and steel rust when they...
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How Does a Fire Extinguisher Work?
How Does a Fire Extinguisher Work? Most fire extinguishers smother a fire by shutting off the supply of air with certain chemicals. The carbon dioxide extinguisher...
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Why Is the Sky Blue?
The daytime sky is blue because of what happens to sunlight as it enters the Earth’s atmosphere. When the Sun is low near the horizon as it rises or sets, the...
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What Makes Plant Leaves Green?
What Makes Plant Leaves Green? The green we see in leaves comes from a green substance called “chlorophyll,” which the plant uses in making food. Chlorophyll is found...
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