# Is kilo-Kelvin ($\rm kK$) avoided as it would be confusing?

When describing the colour of light globes, you see temperatures like 2700 K or 6000 K. The surface of the sun is around 5500 K. This could be written as 2.7 kilo-Kelvin or 2.7 kK (or 6 kK, 5.5 kK respectively), but is this avoided for clarity?

• If you're speaking about labels written for the general public, most people barely know what Kelvin is let alone kK Commented Aug 24, 2023 at 13:05
• The unit when fully spelled it is in lowercase ("kelvin"). See en.wikipedia.org/wiki/Kelvin Commented Aug 24, 2023 at 13:07
• There really isn't a reason for it. It is just a convention, You might as well say habit. People are used to it, so it would look odd to do it another way. Commented Aug 24, 2023 at 13:16
• If memory serves, there was a short period of time when the “Kayser” was defined as 1000 wavenumbers. So 500 nm was 20 kK, with K as the symbol for Kayser. Thankfully, this is kaput (no symbol needed)!
– Ed V
Commented Aug 24, 2023 at 13:23