What Is a Vacuum?
What Is a Vacuum? A vacuum, in theory, is a space entirely devoid of matter. But no method has been devised for producing one. In practice, therefore, a vacuum is an...
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What Is an Aerosol?
What Is an Aerosol? An aerosol consists of fine particles of liquid or solid substances suspended in the air, or in any other gas. It is not, as many people think,...
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Where Does the Wax Go When Candles Burn?
Where Does the Wax Go When Candles Burn? Nowhere-it simply changes into other substances. That is what burning does to everything. The moment you put a match to the...
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Why Do We Burp?
A burp (sometimes called a belch or by its medical term, eructation) is the release of gas from the digestive tract (in this case, the esophagus and stomach) through...
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When Was the Thermometer Invented?
When Was the Thermometer Invented? The first practical thermometer or instrument for measuring temperature was invented shortly before the end of the 16th Century by...
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