The Celsius scale was pinned to water: zero for freezing, one hundred for boiling. The kelvin scale starts somewhere more fundamental, at absolute zero, the coldest anything can ever be, where particle motion all but stops.
A temperature in kelvin equals the Celsius temperature plus 273. The kelvin scale begins at absolute zero (0 K, about minus 273 degrees Celsius), the lowest temperature possible, where the particles have their minimum energy.
A temperature in kelvin (K) equals the temperature in degrees Celsius plus 273. Absolute zero is the lowest possible temperature, 0 K.
There is no temperature below 0 K, so a kelvin value can never be negative.
Move the temperature and watch the Celsius and kelvin readings change together.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
To convert a temperature in degrees Celsius to kelvin you...
Absolute zero is...
A temperature of 0 degrees Celsius is equal to...
At absolute zero the particles have...
Going from Celsius to kelvin is a single step, and the scale has a hard lower limit.
The conversion, with a worked example:
Convert 25 degrees Celsius to kelvin.
The kelvin scale starts at absolute zero, so a kelvin temperature can never be negative. After converting, always check your answer is not below 0 K; if it is, something has gone wrong.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
A temperature of 27 degrees Celsius expressed in kelvin is...
A gas is at 500 K. Its temperature in degrees Celsius is...
Which of these is the coldest temperature?
Particle model nearly complete. Keep the chain going.