flour and dough

Hi expert teachers,

I think “She is kneading the flour” is incorrect to a native speaker and he will use “dough” instead. But it really baffles me. I had been thinking about this the whole day but couldn’t reach a conclusion.

We put flour and then we add water and start kneading. Why do I have to use “dough”? Can you please expound?

Many thanks in advance.

Flour is a powdery substance and is impossible to knead. Adding water turns flour into dough, which is a different thing. A similar comparison is dirt - add water and it turns into mud.