Measuring Temperature

1
Chapter 1

• Measuring Temperature

2
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.

3
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

4
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

5
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.

6
Temperature Scales

• Fahrenheit Celsius Kelvin
• Water boils _____F _____C
  ______K
• Water freezes _____F _____C
  ______K

7
Temperature Scales

• Fahrenheit Celsius Kelvin
• Water boils 212F 100C 373
  K
• Water freezes 32F 0C 273
  K

8
Units of Temperature between Boiling and Freezing

• Fahrenheit Celsius Kelvin
• Water boils 212F 100C 373
  K
• 180 100C
  100K
• Water freezes 32F 0C 273
  K

9
Learning Check

• A. Temperature of freezing water
• 1) 0F 2) 0C 3) 0 K
• B. Temperature of boiling water
• 1) 100F 2) 32F 3) 373K
• C. Number of Celsius units between the
• boiling and freezing points of water
• 1) 100 2) 180 3) 273

10
Solution

• A. Temperature of freezing water
• 2) 0C
• B. Temperature of boiling water
• 3) 373K
• C. Number of Celsius units between the
• boiling and freezing points of water
• 1) 100

11
Fahrenheit Formula

• 180F 9F 1.8F 100C
  5C 1C
• Zero point 0C 32F
• F 9/5 TC 32
• or
• F 1.8 TC 32

12
Celsius Formula

• Rearrange to find TC
• F 1.8 TC 32
• F - 32 1.8TC ( 32 - 32)
• F - 32 1.8 TC
• 1.8 1.8
• F - 32 TC
• 1.8

13
Temperature Conversions

• A person with hypothermia has a body temperature
  of 29.1C. What is the body temperature in F?
• F 1.8 (29.1C) 32
• exact tenth's
  exact
• 52.4 32
• 84.4F
• tenths

14
Learning Check

• The normal temperature of a chickadee is
  105.8F. What is that temperature in C?
• 1) 73.8 C
• 2) 58.8 C
• 3) 41.0 C

15
Solution

• 3) 41.0 C
• Solution
• C (F - 32)
• 1.8
• (105.8 - 32)
• 1.8
• 73.8F
• 1.8 41.0C

16
Learning Check

• Pizza is baked at 455F. What is that in C?
• 1) 437 C
• 2) 235C
• 3) 221C

17
Solution

• Pizza is baked at 455F. What is that in C?
• 2) 235C
• (455 - 32) 235C
• 1.8

18
Learning Check

• On a cold winter day, the temperature falls to
  -15C. What is that temperature in F?
• 1) 19 F
• 2) 59F
• 3) 5F

19
Solution

• 3) 5F
• Solution
• F 1.8(-15C) 32
• -27 32
• 5F

20
Kelvin Scale

• On the Kelvin Scale
• 1K 1C
• 0 K is the lowest temperature
• 0 K - 273C
• K C
• K C 273

21
Learning Check

• What is normal body temperature of 37C in
  kelvins?
• 1) 236 K
• 2) 310 K
• 3) 342 K

22
Solution

• What is normal body temperature of 37C in
  kelvins?
• 2) 310 K
• K C 273
• 37 C 273
• 310. K