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Chapter 1

Chapter 1. Measuring Temperature. 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. Learning Check.

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Chapter 1

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  1. Chapter 1 Measuring Temperature LecturePLUS Timberlake

  2. 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. LecturePLUS Timberlake

  3. Learning Check 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 LecturePLUS Timberlake

  4. 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 LecturePLUS Timberlake

  5. 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. LecturePLUS Timberlake

  6. Temperature Scales Fahrenheit Celsius Kelvin Water boils _____°F _____°C ______K Water freezes _____°F _____°C ______K LecturePLUS Timberlake

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

  8. Units of Temperature between Boiling and Freezing Fahrenheit Celsius Kelvin Water boils 212°F 100°C 373 K 180° 100°C 100K Water freezes 32°F 0°C 273 K LecturePLUS Timberlake

  9. Learning Check A. Temperature of freezing water 1) 0°F 2) 0°C 3) 0 K B. Temperature of boiling water 1) 100°F 2) 32°F 3) 373K C. Number of Celsius units between the boiling and freezing points of water 1) 100 2) 180 3) 273 LecturePLUS Timberlake

  10. Solution A. Temperature of freezing water 2) 0°C B. Temperature of boiling water 3) 373K C. Number of Celsius units between the boiling and freezing points of water 1) 100 LecturePLUS Timberlake

  11. 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 LecturePLUS Timberlake

  12. 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 LecturePLUS Timberlake

  13. 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 LecturePLUS Timberlake

  14. Learning Check 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 LecturePLUS Timberlake

  15. Solution 3) 41.0 °C Solution: °C = (°F - 32) 1.8 = (105.8 - 32) 1.8 = 73.8°F 1.8° = 41.0°C LecturePLUS Timberlake

  16. Learning Check Pizza is baked at 455°F. What is that in °C? 1) 437 °C 2) 235°C 3) 221°C LecturePLUS Timberlake

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

  18. Learning Check 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 LecturePLUS Timberlake

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

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

  21. Learning Check What is normal body temperature of 37°C in kelvins? 1) 236 K 2) 310 K 3) 342 K LecturePLUS Timberlake

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

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