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Temperature Measuring Temperature

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Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the substance gets hotter. When a substance gets hotter, its temperature goes up.

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Energy and Kinetics Suppose you place water in a freezer. A. The water particles move 1) faster 2) slower 3) the same B. The water will get 1) hotter 2) colder 3) stay the same C. The temperature of the water will be 1) higher 2) lower 3) the same

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Solution Suppose you place water in a freezer. A. The water particles move 2) slower B. The water will get 2) colder C. The temperature of the water will be 2) lower

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Temperature Measures the hotness or coldness of an object Determined by using a thermometer that contains a liquid that expands with heat and contracts with cooling.

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Temperature Scales Fahrenheit Celsius Kelvin Water boils 212°F 100°C 373 K Water freezes 32°F 0°C 273 K

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Units of Temperature between Boiling and Freezing FahrenheitCelsius Kelvin Water boils 212°F 100°C 373 K 180° 100°C 100K Water freezes 32°F 0°C 273 K

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Fahrenheit Formula 180°F = 9°F =1.8°F 100°C 5°C 1°C Zero point: 0°C = 32°F °F = 9/5 T°C + 32 or °F = 1.8 T°C + 32

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Celsius Formula Rearrange to find T°C °F = 1.8 T°C + 32 °F - 32 = 1.8T°C ( +32 - 32) °F - 32 = 1.8 T°C 1.8 1.8 °F - 32 = T°C 1.8

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Temperature Conversions A person with hypothermia has a body temperature of 29.1°C. What is the body temperature in °F? °F = 1.8 (29.1°C) + 32 exact tenth's exact = 52.4 + 32 = 84.4°F tenth’s

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Temperature Conversions The normal temperature of a chickadee is 105.8°F. What is that temperature in °C? 1) 73.8 °C 2) 58.8 °C 3) 41.0 °C

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Solution 3) 41.0 °C Solution: °C = (°F - 32) 1.8 =(105.8 - 32) 1.8 =73.8°F 1.8°= 41.0°C

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Temperature Conversions Pizza is baked at 455°F. What is that in °C? 1) 437 °C 2) 235°C 3) 221°C

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Solution Pizza is baked at 455°F. What is that in °C? 2) 235°C (455 - 32) = 235°C 1.8

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Temperature Conversions On a cold winter day, the temperature falls to -15°C. What is that temperature in °F? 1) 19 °F 2) 59°F 3) 5°F

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Solution 3) 5°F Solution: °F = 1.8(-15°C) + 32 = -27 + 32 = 5°F

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Kelvin Scale On the Kelvin Scale 1K = 1°C 0 K is the lowest temperature 0 K = - 273°C K °C K = °C + 273

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Using Kelvin What is normal body temperature of 37°C in kelvin? 1) 236 K 2) 310 K 3)342 K

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Solution What is normal body temperature of 37°C in kelvin? 2) 310 K K = °C + 273 =37 °C + 273 =310. K

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Basic Temperature Formulas

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K = C + 273

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