# Butane blowtorch condensing liquid on heating surface

I have a small Butane blowtorch, and use it to heat an Aluminium plate. The plate is thick so takes 20 seconds or so to really start heating up.

As soon as I apply the heat, droplets of some liquid start "condensing" on the surface of the metal around the general area of the flame.

The liquid is colorless and odorless and is at room temperature, note this happens when the metal is still at room temperature as it hasn't heated up much yet.

What is this liquid exactly and why/how does it form? I suspect it could be a $C_{4}H_{10} + O_{2}$ reactant but not sure. Thanks!

$$\ce{2C4H10(g) + 13O2(g) -> 8CO2(g) + 10H2O(g)}$$
• That sounds right to me then. I updated my question with a thought that the $C_{4}H_{10} + O_{2}$ reactant could involve water and that makes sense now, I'll try with a smaller piece of Al tomorrow to test the theory. Thanks! – baharini Jul 12 '14 at 1:58