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Physicist Daniel Gabriel Fahrenheit scale of temperature suggested by the 1724 Fahrenheit (1686-1736), and is named after. Today, it is mainly used in the United States and several other countries and the rest of the world uses Celsius. So if you're in a country that uses one and want to convert it to another? Here is how you do it
What's the difference
Fahrenheit
On the Fahrenheit scale, the freezing point of water is 32 degrees Fahrenheit (°F), and the boiling point is 212°F (at standard atmospheric pressure). There are 180 equal divisions between the freezing temperature of water and its boiling point. Each division is a Fahrenheit degree
Celsius
On the Celsius scale, the freezing point of water is 0 degrees Celsius (°C) and the boiling point of water is 100°C (at standard atmospheric pressure). There are 100 equal divisions between the freezing temperature of water and its boiling point. Each division is a Celsius degree
Each degree Fahrenheit equals of a degree Celsius
Each degree Celsius equals of a degree Fahrenheit
Fahrenheit to Celsius
Given the Fahrenheit reading, use the following formula to get the Celsius reading
Celsius to Fahrenheit
Given the Celsius reading, use the following formula to get the Fahrenheit reading
Here are some practice problems (and solutions) for converting from one temperature scale to another
Sample Problem 1
When I lived in Russia, one of the coldest outside temperatures I experienced was −45°C. The coldest temperature I experienced in the United States (in Maryland) was +3°F. What is the difference in the coldest temperatures on the Fahrenheit scale
Step 1: Change the Celsius temperature to Fahrenheit using the formula and substituting the value of −45°C
We found that the coldest temperature I experienced in Russia was −49°F
Step 2: To find the difference between the coldest temperatures in two countries, subtract the coldest temperature in Russia from the coldest temperature in the United States
+3°F − (−49°F) = +3°F + 49°F = 52°F
Solution: The difference between the two coldest temperatures is 52°F
Sample Problem 2
Find the temperature where both temperature scales converge
Step 1: Since we want to equalize both temperature scales, we can write this mathematically as
°C = °F
Step 2: Use the conversion formula
Plug in the right side of the preceding equation into the right side of the equation in Step 1
Isolate the variable
Multiply both sides by 5
5C − 9C = 5(32)
Collect like terms and multiply on the right side
−4C = 160
Divide both sides by −4
C = −40
We found that a temperature of −40°C = −40°F is the one at which both temperature scales converge
Solution: −40°C = −40°F
Sample Problem 3
Normal room temperature is 72°F. What is it on the Celsius scale
Step 1: Change the Fahrenheit temperature to Celsius using the formula and substituting the value of 72°F
We rounded the answer to the hundredths place
Solution: Normal room temperature is 22.22°C
Sample Problem 4
If the temperature drops 36°F, what is the corresponding drop on the Celsius scale
Step 1: We know that each degree Fahrenheit equals of a degree Celsius, so we can state
Step 2: We know how much 1 Fahrenheit degree is. To find how much 36°F is, we need to multiply the right side of the expression in Step 1 by 36
Solution: A 36°F drop of temperature on the Fahrenheit scale means a 20°C temperature drop on the Celsius scale
Sample Problem 5
If the temperature raises 45°C, what is the corresponding rise on the Fahrenheit scale
Step 1: We know that each degree Celsius equals of a degree Fahrenheit, so we can state
Step 2: Since we know how much 1 Celsius degree is, to find how much 45°C is, we need to multiply the right side of the expression in Step 1 by 45
Solution: A 45°C rise in temperature on the Celsius scale means an 81°F rise on the Fahrenheit scale
Now that you know how to convert from Celsius to Fahrenheit (and vice versa), you’ll never again wonder, “Just how cold is 3 degrees Celsius
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