lectureplus timberlake1 chapter 1 measuring temperature

LecturePLUS Timberlake 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

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

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

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

Fahrenheit Celsius Kelvin

Water boils _____°F _____°C ______K

Water freezes _____°F _____°C ______K


Temperature Scales


Water boils 212°F 100°C 373 K

Water freezes 32°F 0°C 273 K


Units of Temperature between Boiling and Freezing


Water boils 212°F 100°C 373 K

180° 100°C 100K

Water freezes 32°F 0°C 273 K


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

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

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

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

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

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

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

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

1) 437 °C

2) 235°C

3) 221°C


Solution

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

2) 235°C

(455 - 32) = 235°C

1.8


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

3) 5°F

Solution:

°F = 1.8(-15°C) + 32

= -27 + 32

= 5°F


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

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

1) 236 K

2) 310 K

3) 342 K


Solution

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

2) 310 K

K = °C + 273

= 37 °C + 273

= 310. K

lectureplus timberlake1 chapter 1 measuring temperature

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