What proof does alcohol have to be light on fire?

Alcohol is flammable because of its chemical structure and its ability to readily vaporize. Here's why:

* Chemical Structure: Alcohol molecules contain carbon, hydrogen, and oxygen atoms arranged in a way that allows them to easily bond with oxygen in the air. This bond formation releases energy, which manifests as heat and light, resulting in combustion.

* Vaporization: Alcohol has a relatively low boiling point, meaning it easily evaporates into the air. The alcohol vapor mixes with oxygen, creating a flammable mixture that can ignite if exposed to a source of heat or flame.

In short: Alcohol's chemical makeup and its ability to readily vaporize allow it to easily react with oxygen, producing the energy needed for combustion, making it flammable.