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LecturePLUS Timberlake 1 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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Page 1: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 1

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.

Page 2: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 2

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

Page 3: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 3

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

Page 4: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 4

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.

Page 5: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 5

Temperature Scales

Fahrenheit Celsius Kelvin

Water boils _____°F _____°C ______K

Water freezes _____°F _____°C ______K

Page 6: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 6

Temperature Scales

Fahrenheit Celsius Kelvin

Water boils 212°F 100°C 373 K

Water freezes 32°F 0°C 273 K

Page 7: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 7

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

Page 8: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 8

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

Page 9: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 9

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

Page 10: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 10

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

Page 11: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 11

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 x 5/9) – 32 = C

Page 12: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 12

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

Page 13: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 13

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

Page 14: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 14

Solution

3) 41.0 °C

Solution:

°C = (°F - 32)

1.8

= (105.8 - 32)

1.8

= 73.8°F

1.8° = 41.0°C

Page 15: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 15

Kelvin Scale

On the Kelvin Scale

1K = 1°C

0 K is the lowest temperature

0 K = - 273°C

K °C

K = °C + 273

Page 16: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 16

Learning Check

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

1) 236 K

2) 310 K

3) 342 K

Page 17: LecturePLUS Timberlake1 Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the

LecturePLUS Timberlake 17

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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