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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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chapter 1
Chapter 1

Measuring Temperature

LecturePLUS Timberlake

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.

LecturePLUS Timberlake

learning check
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

solution
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

temperature5
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

temperature scales
Temperature Scales

Fahrenheit Celsius Kelvin

Water boils _____°F _____°C ______K

Water freezes _____°F _____°C ______K

LecturePLUS Timberlake

temperature scales7
Temperature Scales

Fahrenheit Celsius Kelvin

Water boils 212°F 100°C 373 K

Water freezes 32°F 0°C 273 K

LecturePLUS Timberlake

units of temperature between boiling and freezing
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

learning check9
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

solution10
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

fahrenheit formula
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

celsius formula
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

temperature conversions
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

learning check14
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

solution15
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

learning check16
Learning Check

Pizza is baked at 455°F. What is that in °C?

1) 437 °C

2) 235°C

3) 221°C

LecturePLUS Timberlake

solution17
Solution

Pizza is baked at 455°F. What is that in °C?

2) 235°C

(455 - 32) = 235°C

1.8

LecturePLUS Timberlake

learning check18
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

solution19
Solution

3) 5°F

Solution:

°F = 1.8(-15°C) + 32

= -27 + 32

= 5°F

LecturePLUS Timberlake

kelvin scale
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

learning check21
Learning Check

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

1) 236 K

2) 310 K

3) 342 K

LecturePLUS Timberlake

solution22
Solution

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

2) 310 K

K = °C + 273

= 37 °C + 273

= 310. K

LecturePLUS Timberlake