ASVAB Paragraph Comprehension
Read the paragraphs and answer the following questions.
The refrigerator, as we know it, was a long time in the making, with a number of people making various contributions to its development. One of the earliest pioneers in refrigeration was Dr. William Cullen, who, in the 1700s, conducted experiments regarding the evaporation of liquids in a vacuum. Further experiments using evaporation of liquids to cool were conducted by Benjamin Franklin and John Hadley in 1758. Their work proved that the rapid evaporation of certain volatile liquids could lower the temperature of an object below the freezing point of water. In the steamy weather of Apalachicola, Florida, Dr. John Gorrie came to believe that tropical diseases like yellow fever could be cured by cooling the rooms of patients. Gorrie suspended ice in a basin from the ceilings in sick rooms, knowing that cooler air is heavier and would therefore flow downward to the patients.
Cullen, Franklin, Hadley and Gorrie each made their contribution to refrigeration, but the first refrigerator itself is generally attributed to the German engineer Carl von Linde. In 1876, von Linde perfected the means of converting large amounts of liquids-specifically, ammonia, sulfur dioxide, and methyl chloride-- into gases, for keeping an environment cool. Linde's vapor-compression refrigeration system became-and is still-the most widely-used method of cooling.
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