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TEMPERATURE PART I The temperature of something tells us how hot or cold something is. TEMPERATURE IS MEASURED IN DEGREES USING A THERMOMETER IS THE SYMBOL FOR DEGREES. 100 “100 Degrees” How to Read a Thermometer Temperature is measured on two scales: Celsius and Fahrenheit. 37 C 98.6 F C “C” is the symbol for the Celsius scale. The Fahrenheit scale is the most popular in the United States. F Its symbol is “F.” Let’s count by 2’s… 2, 4, 6, 8, 10, 12… F The lines on most thermometers count by two’s. 102 100 98 96 94 92 90 What is the temperature on this thermometer? 98 F “98 degrees Fahrenheit” F 100 96 94 92 90 88 Try this one. F 90 88 86 F “86 degrees Fahrenheit” 84 82 80 78 76 Normal body temperature is 98.6 F. This means it is between 98 and 99 degrees. 98.6 F This is a decimal point. .2 .4 .6 96 97 98 99 98.6 F THE TEMPERATURE IS “98 POINT 6” DEGREES FAHRENHEIT. 99 100 101 102 What is the temperature? 101.2 F Try this one. 100 101 102 102.8 F 103 6 NEGATIVE NUMBERS The temperature scale is often seen vertically. 5 4 3 2 1 0 As the temperature goes below freezing we use negative numbers. Getting warmer Water freezing -1 -2 -3 -4 -5 -6 Getting colder Fahrenheit (1686-1736) established three fixed points on his thermometer. 0 degrees: temperature of an ice, water, and salt mixture. 32 degrees: water-ice combination stabilized at "the thirty-second degree." 98 degrees: “when the thermometer is held in the mouth or under the armpit of a living man in good health." Celsius (1701-1744) established two fixed points on his thermometer. 0°C: representing the freezing point of water. 100°C: the boiling point of water. PROBLEM Riki measured the outside temperature at noon and then again at 8 p.m. The temperature at noon was 6°C. The temperature at 8 p.m. was – 2°C. What was the change in temperature? 1. You can use the thermometer like a number line. There was a _____change in temperature. PART II … HOW CAN I CONVERT FROM CELSIUS TO FAHRENHEIT OR FAHRENHEIT TO CELSIUS?? FORMULAS Celsius to Fahrenheit: (°C × 9/5) + 32= °F Multiply by 9, then divide by 5, then add 32 Fahrenheit to Celsius: (°F − 32) x 5/9 = °C Deduct 32, then multiply by 5, then divide by 9 IN OTHER WORDS: