Download - How to Read a Thermometer A thermometer is an instrument that is used to measure temperature
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How to Read a Thermometer
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A thermometer is an instrument that is used to
measure temperature.
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The temperature of something tells us how hot
or cold something is.
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Temperature is measured in
degrees.
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is the symbol for degrees.
100 “100 Degrees”
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Temperature is measured on two scales: Celsius and Fahrenheit.
98.637 C F
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“C” is the symbol for the Celsius scale.
C
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The Fahrenheit scale is the most popular in the United States.
Its symbol is “F.”
F
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Let’s count by 2’s…
2, 4, 6, 8, 10, 12…
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The lines on most
thermometers count by two’s. 90
92949698
100102
F
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8890929496
100
FWhat is the temperature
on this thermometer?
98 F
“98 degrees Fahrenheit”
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7678808284
88
F90
Try this one.
86 F
“86 degrees Fahrenheit”
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Normal body temperature is 98.6 F.
This means it is between 98 and 99 degrees.
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98.6 F
This is a decimal point.
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97 98 99
.2 .4 .6
98.6 F
The temperature is “98 point 6” degrees Fahrenheit.
96
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98 99 100
.2 .4 .6 .8
99.8 F
The temperature is “99 point 8” degrees Fahrenheit.
97
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100 101 102
What is the temperature?
101.2 F
99
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Try this one.
102.8 F
101 102 103100
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Negative Numbers
The temperaturescale is often seen
vertically.
As the temperature goes below freezing
we use negative numbers.
0
1
2
3
4
5
6
- 1
- 2
- 3
- 4
- 5
- 6
Water freezing
Getting warmer
Getting colder
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SCALES
In U.S the Fahrenehit scale is used. The Celsius scale is used in almost all other
countries and by scientists.
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Fahrenheit (1686-1736) established three fixed points on his thermometer.
0 degrees: temperature of an ice, water, and salt mixture.
32 degrees: water-ice combination stabilized at "the thirty-second degree."
98 degrees: “when the thermometer is held in the mouth or under the armpit of a living man in good health."
Celsius (1701-1744) established two fixed points on his thermometer.
0°C: representing the freezing point of water.
100°C: the boiling point of water.
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PROBLEM
Riki measured the outside temperature at noon and then again at 8 p.m. The temperature at noon was 6°C. The temperature at 8 p.m. was – 2°C. What was the change in temperature?
1.You can use the thermometer like a number line.
There was a _____change in temperature.
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PROBLEM SOLVING
One day the lowest temperature recorded in Maine was -12°F. The highest temperature in Maine that day was 25°F. What was the change in temperature?
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Fórmula
°C x 9/5 + 32 = °F
1) Convert 37°C to Fahrenheit.37°C x 9/5 + 32 = 98.6°F
(°F - 32) x 5/9 = °C
2) Convert 98.6°F to Celsius.(98.6°F - 32) x 5/9 = 37°C
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•Use the formula to change each temperature to degrees Fahrenheit.
1. 5° C
2. 35° C3. 20° C4. 15° C
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