Do I use °K or K in chemistry formulas?

No, never use a degree symbol with Kelvin; write temperatures as, for example, three hundred K.

Kelvin is a temperature scale where zero means there is no thermal energy, and we always write it with the letter K and no degree symbol; think of it like writing meters without a little circle. When you use temperatures in chemistry formulas, you treat Kelvin as an absolute measure, so you plug numbers like three hundred K directly into equations such as those for gas laws or rate constants. Celsius and Fahrenheit use a degree symbol because they are relative scales, but Kelvin is defined from absolute zero, so the symbol would be incorrect and confusing. Writing three hundred K keeps units clear and math correct, because the value is already on the absolute scale chemists need.

Students often write a small circle before K out of habit from degrees Celsius, which makes units wrong; stop and remember Kelvin is special and drop the circle. Another mistake is plugging Celsius values into formulas without converting to Kelvin; always add two hundred and seventy three to Celsius when a formula needs absolute temperature. A third confusion comes from seeing K used without a space after the number in informal notes; keep a space like three hundred K so readers know it is a unit, not part of the number.

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Kelvin Units: Use K, Not °K

1. Use K without a degree symbol
2. Write temperatures like “300 K”
3. Kelvin is an absolute temperature scale
4. Plug K directly into equations
5. Celsius and Fahrenheit use degrees
6. Writing “300 K” keeps units clear

Kelvin Usage: Write “K” Without Degree Symbol

1. Using a degree symbol with K
2. Not converting Celsius to Kelvin
3. Omitting space between number and K

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