How Is Soap Made?
When you wash with soap, you are using a cleaning material made chiefly of animal fats, vegetable oils and an alkali chemical. In the soap factory, the soap materials...
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What Keeps an Igloo Warm Inside?
What Keeps an Igloo Warm Inside? If you were an Eskimo living in the far north of Canada, you might build your winter house from blocks of snow and sleep on a bed of...
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What Makes the Bubbles Form When Water Boils?
What Makes the Bubbles Form When Water Boils? When you boil water in a tea-kettle, you heat it to the point where it changes from a liquid to an invisible water gas...
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How Does Dew Form?
How Does Dew Form? On clear summer mornings the grass is often wet with dew. Dew is liquid water droplets that form on grass, spider webs and other things in the early...
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How Does a Coffee Percolator Work?
How Does a Coffee Percolator Work? Many people brew their coffee in coffee pots called percolators. Inside a coffee percolator is a hollow stem. Sitting on top of the...
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