The color of the pool water is so varied. The most amazing thing is that if you spit a cigarette at the edge of the pool, it is pointed out that the steam will be more enthusiastic! The most scientific explanation, do you know how rain and snow are formed? Originally, the water vapor state is invisible. Because of the appearance of condensation nuclei such as dust, water vapor is attached, and it becomes rain or snow with temperature. The smoke sprayed here is equivalent to providing a large amount of condensation nuclei, so that more invisible water vapor becomes a state recognizable to the naked eye.