Why are certain gasses so flammable? What makes hydrogen so combustious? Is it because they have low kindling points? If so what determines a kindling point, and are gasses known to have lower kindling points compared to solids? Here is an extra curricular question: What makes Carbon so strong? That is a little off topic but I don't want to have to make another thread and crowd up the boards with my ignorance. Help me rid myself of my incompetence.