# Zeroth Law of Thermodynamics

1. Oct 14, 2008

### Beastcloud

Is there a set average temperature for the universe? And taking into consideration our habitable temperature is x being closer to y than z. If so where does zeroth law of thermodynamics fit?

x='s earths surface average temperature
y='s absolute zero
z='s surface of the sun

What percentage of the universe would be habitable solely based on temperature.

A link will do, I've been trolling around thermodynamic web forums and the like...

-Beastcloud

Last edited: Oct 14, 2008
2. Oct 14, 2008

### DaveC426913

Well, 4K is a pretty good answer.

By "habitable" I will assume "life as we know it". If you wish to change that, you'll need to be more specific.

And with that assumption, the answer is easy: the liquid range of water: 273K-373K. This is is known as the Goldilocks Zone.

But I'm not sure those are the answers you were looking for...

Last edited: Oct 14, 2008