brought to you by powerpointpros.com reading a thermometer
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Brought to you by powerpointpros.com
Reading a Thermometer
The temperature tells us how hot or how cold something is.
What is Temperature?
Temperature is measured in degrees. The symbol for degrees is °.
So “45°” means the same thing as“45 degrees.”
Measuring Temperature
Temperature is measured using two scales: Celsius and Fahrenheit.
Measuring Temperature
The letter C is the symbol for the Celsius scale.
Celsius
°C
The letter F is the symbol for the Fahrenheit scale. The Fahrenheit scale is very common in the United States.
Fahrenheit
°F
A thermometer is an instrument that is used to measure temperature.
What is a Thermometer?
This is a thermometer.The letter and degree symbol at the top tell us whether the thermometer measures temperature using Fahrenheit (F) or Celsius (C).
Reading a Thermometer________________________________________________
°F
The numbers on the side and the lines on the thermometer help us figure out what temperature is being displayed.The red bar moves up or down depending on the temperature.
Reading a Thermometer________________________________________________
°F100
90
80
70
Since the red bar lines up with the number 90, that tells us that the temperature is 90 degrees Fahrenheit (90°F).
Reading a Thermometer________________________________________________
°F100
90
80
70
However, on this thermometer, not all of the lines are numbered. What if the temperature bar doesn’t line up with a marked line?
Reading a Thermometer________________________________________________
°F100
90
80
70
Usually, the lines on a thermometer count by twos. To make sure that they do on this thermometer, let’s start at 70 and count by twos for each line until we reach 80.
Reading a Thermometer________________________________________________
°F100
90
80
707274
7678
80
Since when we counted by twos, our last number (80) matched up with the number 80 that was marked on the thermometer, we know that this thermometer does count by twos!
Reading a Thermometer________________________________________________
°F100
90
80
707274
7678
80
Since we know that on this thermometer, each line counts by twos, we can figure out the temperature!
Reading a Thermometer________________________________________________
°F100
90
80
707274
7678
80
We can see that the red bar on this thermometer is higher than 80 but lower than 90, we’ll start at 80 and count by twos until we reach the top of the red bar.
Reading a Thermometer________________________________________________
°F100
90
80
70
828486
We counted by twos until we reached the top of the red bar on the thermometer. Since it lines up with 86-degree mark, the temperature shown on this thermometer is 86 degrees Fahrenheit!
Reading a Thermometer________________________________________________
°F100
90
80
70
828486
Sometimes, the red bar lines up in between two lines on the thermometer.
Reading a Thermometer________________________________________________
°F100
90
80
70
Since we know that this thermometer counts by twos, we need to find out which two temperature lines the red bar is in between.
Reading a Thermometer________________________________________________
°F100
90
80
70
The red bar is just above the 80-degree mark. If we count by twos to the next line, we can see that the red bar is just below the 82-degree mark. So, we just need to find the number that’s in between 80 and 82…
Reading a Thermometer________________________________________________
°F100
90
80
70
82
81!The temperature shown on this thermometer is 81 degrees Fahrenheit, since the lines on this thermometer count by twos and the red bar is in between the 80 and 82 marks.
Reading a Thermometer________________________________________________
°F100
90
80
70
82
Now, let’s try reading some more thermometers!
Practice Reading Thermometers
Practice Reading Thermometers________________________________________________
°F70
60
50
40
The red bar already lines up perfectly with the line marked “50”, so the temperature on this thermometer is 50 degrees Fahrenheit (50°F).
Practice Reading Thermometers________________________________________________
°C30
20
10
0
We can now see that the red bar lines up with the 12-degree mark, which means that the temperature on this thermometer is 12 degrees Celsius (12°C)
2468
10
For this one, the red bar doesn’t stop right on a numbered line, so let’s first make sure that the lines on this thermometer count by twos!
?
Now that we know that the lines do count by twos, we can count by twos starting at 10 until we reach the line that’s at the top of the red bar.
Practice Reading Thermometers________________________________________________
°F80
70
60
50
Since the red bar stops right in between 58- and 60-degree marks, the temperature shown on this thermometer is right in between them: 59 degrees Fahrenheit (59°F).
52545658
60?
Let’s first make sure that the lines on this thermometer count by twos.
Since we know that they do, we can now see that the red bar stops in between the 58- and 60-degree marks. So, the temperature must be between those two numbers…
Practice Reading Thermometers________________________________________________
°C40
30
20
10
Now, we can see that the temperature on this thermometer is 38 degrees Celsius (38°C).
12141618
20
32
3436?
Let’s make sure that the lines on this thermometer also count by twos.
They do! We can see that the red bar stops in between 30 and 40 degrees, so, we can count by twos starting at the 32-degree mark until we get to the line where the bar stops.
Now that we’ve practiced reading thermometers together quite a bit, why don’t you try reading thermometers on your own?
More Practice Reading Thermometers
1.
________________________________________________
°F70
60
50
40
What temperature is shown on this thermometer?
Write your answer down on a sheet of paper.
60° F
2.
________________________________________________
°C30
20
10
0
What temperature is shown on this thermometer?
Write your answer down on a sheet of paper.
8° C
3.
________________________________________________
°F50
40
30
20
What temperature is shown on this thermometer?
Write your answer down on a sheet of paper.
44° F
4.
________________________________________________
°F110
100
90
80
What temperature is shown on this thermometer?
Write your answer down on a sheet of paper.
103° F
5.
________________________________________________
°C50
40
30
20
What temperature is shown on this thermometer?
Write your answer down on a sheet of paper.
33° C
You now know how to read a thermometer!
Great job!