Can someone tell me the formula to convert -20 degrees C into Kelvins?

K= C-273

WRONG BOB!!

Here's the right answer kids:

K = °C + 273.15

Please refrain from misleading these children.

Apologies for any confusion. The correct formula to convert Celsius to Kelvin is K = °C + 273.15. To convert -20 degrees Celsius to Kelvin, you would add 273.15 to -20 as follows:

K = -20 + 273.15
K = 253.15 Kelvin

So, -20 degrees Celsius is equivalent to 253.15 Kelvins.