the temperture in which all motion of particles stop

2 answers

-273.15 Degrees Celcius

0 degrees Kelvin
0 degrees Kelvin

I know I am picky but I try to use the correct upper/lower case letters and units. It should be

0 kelvin or 0 K

the unit has a lower case letter, the symbol is upper case. In addition there is no degree sign; this is because the scale has a natural zero whereas the deg F and deg C scales do not.