2 Understand the Relationship Between the Fahrenheit and Celsius Scales In the United States, we use the Fahrenheit scale to measure temperature. In most of the rest of the world, the Celsius scale is used. (Science courses, even in the United States, usually use the Celsius scale.) To get a feel for how these two measures of temperature are related, let’s look at some widely known Fahrenheit temperatures and give their Celsius equivalents. Relationships Between Fahrenheit and Celsius Freezing Point of Water Boiling Point of Water In Degrees Fahrenheit In Degrees Celsius 32F 0C In Degrees Fahrenheit In Degrees Celsius 212F 100C Note The symbol represents degrees. We read 32F as “32 degrees Fahrenheit,” and we read 100C as “100 degrees Celsius.” Here are some other temperatures that might help you understand how the Fahrenheit and Celsius scales are related. The average high temperature in Miami in July is 91F. This is approximately 33C. (www.weather.com) The temperature inside a refrigerator should be at most 40F. This is approximately 4C. (www.usda.gov) This thermometer compares Fahrenheit and Celsius temperatures. C F 50 120 40 30 20 10 0 10 20 30 40 100 80 60 40 20 0 20 40 EXAMPLE 3 Determine which Celsius temperature is appropriate for the situation. a) The average low temperature in Fairbanks, Alaska, in February is . Choose from 28C, 10C, and 28C. (www.weather.com) b) A comfortable household temperature is . Choose from 21C, 50C, and 68C. 606 CHAPTER 7 Measurement and Conversion www.mhhe.com/messersmith
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