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- Look at the two thermometers below.
- Identify which is Celsius and which is Fahrenheit, and then
- label the boiling and freezing points of water on each.
- Now, the Celsius scale is what's used in
- the most of the world.
- And the easy way to tell that you're dealing with the
- Celsius scale is on the Celsius scale, 0 degrees is
- freezing of water at standard temperature and pressure, and
- 100 degrees is the boiling point of water at standard
- temperature and pressure.
- Now, on the Fahrenheit scale, which is used mainly in the
- United States, the freezing point of water is 32 degrees,
- and boiling of water is 212 degrees.
- As you could tell, Celsius, the whole scale came from
- using freezing as 0 of regular water at standard temperature
- and pressure and setting 100 to be boiling.
- On some level, it makes a little bit more logical sense,
- but at least here in the U.S., we still use Fahrenheit.
- Now let's figure out which of these are Fahrenheit and which
- are Celsius.
- Now remember, regardless of which thermometer you're
- using, water will always actually boil at the exact
- same temperature.
- So Fahrenheit, 32 degrees, this has to be the same thing
- as Celsius 0 degrees.
- So let's see what happens.
- So when this temperature right here is 0, this one over here,
- it looks like it's negative something.
- So this one right here doesn't look like Celsius.
- Here, if we say this is Celsius, this looks pretty
- close to 32 on this one.
- Let me do that in a darker color.
- So this one right here looks like Celsius, and this one
- right here looks like Fahrenheit.
- And the way I was able to tell is that the 0 degrees Celsius
- needs to be the same thing as 32 degrees Fahrenheit.
- In both cases, this is where water freezes,
- the freezing point.
- That is water freezing.
- And let's make sure we're right.
- So if this is the Celsius scale, this is where water
- will boil, 100 degrees Celsius, and that looks like
- it is right about 212 on the other scale.
- So right there is where water is boiling at standard
- temperature and pressure.
- So this thing on the right, right here, I guess I'll
- circle it in orange, that is Celsius.
- And then the one on the left, I'll do it in magenta, the one
- on the left is Fahrenheit.