the.com/absolute zero
The temperature where molecules stop fidgeting and physics finally shuts up.
means Absolute zero is the lowest possible temperature, −273.15°C (0 Kelvin), at which a substance's particles hold the minimum thermal energy allowed by physics.
from The concept grew out of 19th-century work on gas laws — scientists noticed that gas volume and pressure dropped in neat proportion with temperature, and extrapolated the line to the point where it would hit zero. Lord Kelvin formalized this into an absolute temperature scale, giving the idea its name: not 'zero' as in a thermometer's arbitrary starting line, but zero as in nothing left to take away. The 'absolute' marks it as a true physical floor rather than a man-made benchmark like freezing water.
- the number
- -273.15°C, zero on the Kelvin scale
- unreachable
- third law of thermodynamics forbids actually hitting it
- closest attempt
- labs reached within a billionth of a degree
- not stillness
- quantum motion never fully vanishes, even there