Question

if you had a trapped gas and continued to cool it until the lowest possible temperature is reached the temperature is called

Answer 1

Absolute Zero.

Kelvin 0 is Absolute Zero, the atoms cannot physically become any closer.
Celsius -273.15

Answer 2

Absolute Zero

Step-by-step explanation:

The lowest limit of thermodynamic temperature is called as absolute zero. By international agreement, on kelvin scale it is 0 K and on Celsius scale it is equal to -273.15° C. This is considered as the lowest possible temperature. At this temperature the particle vibration is minimum and no heat energy remain in the substance.