Meaning of Fuel parameter (on source) when doing liquid

[davision]

I followed Michael McCarthy's tutorial for creating liquids. Very handy. The one parameter that I don't understand though is when setting the Fuel parameter on the Source. The default is 1.

What does this value mean? What is 1, versus 20 versus .1? What does it translate to in the real world?

In the docs, it talks about the fuel value referring to the level of concentration, but when I think about liquids (at least water) there is no variable concentration since water can't be compressed, right?

(By the way, I love the fact that Phoenix is doing liquids now --I just want to understand their implementation a bit better).

[Ivaylo Katev]

when the fuel is used as liquid the recommended value of the source is 1, if is bigger the liquid will expand until reach the value of 1.
if the value is less than 1, it will form droplets like condensing vapour.