Sounds like a weak ass stand. No offense but create something more interesting like how i made hierophant platinum

*chuckles darkly*

How about changing the ability so you can change the atomic structure of what you touch and create anything with nearby elements? However, to activate this ability, you must know the chemical formula of what you will be creating, such as being able to know the formula H2O if you want to create water.

I can for example, turn a space of air solid, which would be instantly at its freezing point in temperature, or turn metal to superheated gas

So you can Vitamin C anyone if you touch them? Thats quite powerful (not to mention the other uses for the ability)