Now, temperature can be measured in units of Celsius, Fahrenheit and Kelvin. And when it comes to these temperature units, we can convert between them. In order to convert between them, we just have to utilize certain formulas. Now here we have purple boxes. And when we have these purple boxes, that means that that's a term or formula you have to memorize. OK, you have to commit it to memory because oftentimes it's not given to you on an exam or a quiz.
Now the first one connects Kelvin to degree Celsius, and it's that Kelvin equals degree Celsius plus 273.15. Oftentimes professors will drop the .15 part, but to be as accurate as possible, it's important that you use the whole number, so 273.15. From this equation we can see that Kelvin directly connects to degrees Celsius and we can go between them.
The next equation connects degrees Fahrenheit to degrees Celsius and the equation is degrees Fahrenheit equals 1.8 times degree Celsius plus 32. So this formula here shows us that degree Celsius is connected to degrees Fahrenheit. So from these 3 units we can see that Celsius is in the middle. So Celsius acts as the bridge that connects Kelvin to degrees Fahrenheit.
So just remember, when it comes to temperature, we have 3 units that we can use. And when it comes to changing between them, these are the two formulas you need to commit to memory. Anytime you see a purple box, remember that means you're going to have to memorize either that term, that definition, or in this case, a formula.
K = °C + 273.15 °F = 1.8 × °C + 32