I quote from Wiki:
Absolute zero is the coldest possible temperature. More formally, it is the temperature at which entropy reaches its minimum value. The laws of thermodynamics state that absolute zero cannot be reached using only thermodynamic means. A system at absolute zero still possesses quantum mechanical zero-point energy, the energy of its ground state. The kinetic energy of the ground state cannot be removed. However, in the classical interpretation, it is zero and the thermal energy of matter vanishes.
The zero point of any thermodynamic temperature scale, such as Kelvin or Rankine scale, is set at absolute zero. By international agreement, absolute zero is defined as 0K on the Kelvin scale and as −273.15° on the Celsius scale.
Why is this significant? The COLDEST temperature is -273. Amalek ALSO is the COLDEST. They try to freeze us in our Avodas Hashem. אשר קרך בדרך - They "cooled" us off on the path. Any time we express a spiritual passion Amalek [and the Amalek inside of us] tells us to relax and cools the flames of passion.
ראשית גויים עמלק - The head of all goyim is Amalek. The first letters spell רגע. The pasuk says כי רגע באפו- Hashem's "anger", says the gemara, lasts for a moment - a רגע. Amalek tries to take advantage of that moment to destroy us.
So how COOL is it that the gematria of רגע is 273.
[Based on the sefer מבשרי אחזה אלוה]