Temperature

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Chapter 1 :

LecturePLUS Timberlake 1 Chapter 1 Measuring Temperature

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.

Learning Check :

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

Solution:

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

Temperature:

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.

Temperature Scales:

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

Temperature Scales:

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

Units of Temperature between Boiling and Freezing:

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

Learning Check :

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

Solution :

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

Fahrenheit Formula:

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

Celsius Formula:

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

Temperature Conversions:

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

Learning Check :

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

Solution :

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

Learning Check :

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

Solution :

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

Learning Check :

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

Solution :

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

Kelvin Scale :

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

Learning Check:

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

Solution :

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

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