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# Comparing Celsius and Fahrenheit temperature scales

Comparing Celsius and Fahrenheit temperature scales. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• how would you say 30 celsius in farenheit?
• Another way of convert C to F without having to divide follows:
EX 1: 1500 C = ? F Multiply 1500 by 2 = 3000
Take 10% of 3000 = 300
Subtract 300 from 3000 = 2700
Add 32 to 2700 = 2732 F
Ex 2: 100 C = ? F 100 x2 =200
10% of 200 = 20
200 – 20 = 180
180+32 = 212 F
• If 0 Celsius = 32 Farenheit
Why 100 Celsius = 212 Farenheit? it must be 132 Farenheit.
• The Celsius and Fahrenheit scales do not have the same difference. That is, going up one degree in Celsius is not the same as going up one degree in Fahrenheit. In fact, going up one degree in Celsius means going up 9/5 degrees in Fahrenheit. (You can calculate the formula using the points for freezing point and boiling point.)
• at about he says at standard pressure, I didn't know that pressure mattered, does it raise the freezing point or lower the freezing point?
• Is the word "Farenheit" an acceptable alternative to "Fahrenheit" in the English language or is mostly everyone on this page, including the title and the context of the video (when Sal writes it), misspelling "Fahrenheit"?
• As far as I know, Fahrenheit is the only authoritative form of the word, however Farenheit is an often-made mistake.
• At , why is the Celsius scale called the Celsius scale and why is the Fahrenheit scale called the Fahrenheit scale?
• Fahrenheit (symbol °F) is a temperature scale based on one proposed in 1724 by the physicist Daniel Gabriel Fahrenheit.

Eighteen years later In 1742, Swedish astronomer Anders Celsius (1701–1744) created a temperature scale which was the reverse of the scale now known by the name "Celsius": 0 represented the boiling point of water, while 100 represented the freezing point of water.
• on the Celsius scale what temperature is 48 above the freezing point of water
• Interestingly, water freezes at 0°C. So 48°C is 48° above freezing.
• why are the freezing and boiling temperatures (in Fahrenheit) pretty much based on random numbers unlike Celsius.
• It does seem odd at first. On Wikipedia there is an interesting description of the history of the Fahrenheit scale.

If I understand correctly, Fahrenheit is related to another temperature scale that was based on the freezing point of a saltwater solution. There was some creative thought put into defining the degree scale.

I feel Celsius is much easier to use and understand, but history is a powerful thing.