Temperature

temperature

Basics
Temperature is a measurement of hot or cold.

Temperature is measured in degrees, indicated by the ° sign.

There are two systems of temperature measurement:
(1) Fahrenheit, used in the USA, abbreviated as °F.
At 32 °F, water freezes.
At 212 °F, water boils.

(2) Celsius (also known as Centigrade), used in the rest of the world, abbreviated as °C.
At 0 °C, water freezes.
At 100 °C, water boils.

To convert °F to °C, the following formula is used:
°C = (°F – 32) × \bf\displaystyle\frac{5}{9}

To convert °C to °F, the following formula is used:
°F = °C × \bf\displaystyle\frac{9}{5} + 32

When you encounter a temperature conversion question in the Science test, you will probably be given the appropriate temperature conversion formula.  You should also be allowed to use the calculator for such a question.

A temperature conversion question is an algebraic plug-in, where you plug in a number for a letter.


Question

The temperature outside is 50 °F.  What is the temperature in °C?

Answer
10 °C

Answer Process
See Plug-In.
°C = (°F – 32) × \bf\displaystyle\frac{5}{9}

°C = (50 – 32) × \bf\displaystyle\frac{5}{9} = 10

Calculator Click What You See Comment
clear blinker clears screen
( 50-32 ) ×
fraction 5 down 9 right
(50-32)*\bf\displaystyle\frac{5}{9} °C = (°F – 32) × \bf\displaystyle\frac{5}{9}
Plug in 50 for °F.
enter 10 Answer
Temperature


Question

The temperature outside is 50 °C.  What is the temperature in °F?

Answer
122 °F

Answer Process
See Plug-In.
°F = °C × \bf\displaystyle\frac{9}{5} + 32

°F = 50 × \bf\displaystyle\frac{9}{5} + 32 = 122

Calculator Click What You See Comment
clear blinker clears screen
50 × fraction 9 down 5 right + 32 50*\bf\displaystyle\frac{9}{5}+32 °F = °C × \bf\displaystyle\frac{9}{5} + 32
Plug in 50 for °C.
enter 122 Answer
Temperature


Practice – Questions

°C = (°F – 32) × \bf\displaystyle\frac{5}{9}
1.  The temperature outside is 59 °F.  What is the temperature in °C?
A.  51
B.  \bf\displaystyle\frac{691}{5}
C.  10
D.  15

°C = (°F – 32) × \bf\displaystyle\frac{5}{9}
2.  The temperature outside is 68 °F.  What is the temperature in °C?
A.  2
B.  \bf\displaystyle\frac{772}{5}
C.  20
D.  10

°F = °C × \bf\displaystyle\frac{9}{5} + 32
3.  The temperature outside is 60 °C.  What is the temperature in °F?
A.  41
B.  \bf\displaystyle\frac{140}{9}
C.  10
D.  140

°F = °C × \bf\displaystyle\frac{9}{5} + 32
4.  The temperature outside is 30 °C.  What is the temperature in °F?
A.  86
B.  – \bf\displaystyle\frac{10}{9}
C.  68
D.  10

°F = °C × \bf\displaystyle\frac{9}{5} + 32
5.  The temperature outside is -30 °C.  What is the temperature in °F?
A.  10
B.  -30
C.  -22
D.  22


Practice – Answers
1.  D.  15

2.  C.  20

3.  D.  140

4.  A.  86

5.  C.  -22

 

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