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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.
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
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
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.
LecturePLUS Timberlake 5
Temperature Scales
Fahrenheit Celsius Kelvin
Water boils _____°F _____°C ______K
Water freezes _____°F _____°C ______K
LecturePLUS Timberlake 6
Temperature Scales
Fahrenheit Celsius Kelvin
Water boils 212°F 100°C 373 K
Water freezes 32°F 0°C 273 K
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
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
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
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
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
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
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
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
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
LecturePLUS Timberlake 16
Learning Check
What is normal body temperature of 37°C in kelvins?
1) 236 K
2) 310 K
3) 342 K
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