Chapter 1

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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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Presentation Transcript
Chapter 1

Measuring Temperature

LecturePLUS Timberlake

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

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

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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 _____°F _____°C ______K

Water freezes _____°F _____°C ______K

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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

Fahrenheit Celsius 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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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

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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

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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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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

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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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Learning Check

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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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

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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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Learning Check

What is normal body temperature of 37°C in kelvins?

1) 236 K

2) 310 K

3) 342 K

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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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