What is a flour glass and how it used?

It seems you're asking about a "flour glass", but there is no such thing! It sounds like a made-up term. Perhaps you meant something else?

Here are some possibilities:

* Flour sifter: This is a tool used to sift flour, removing lumps and aerating it. It typically has a fine mesh screen and a handle.

* Measuring cup: This is used to measure out specific amounts of flour for baking. You can get them in various sizes, usually marked in cups, tablespoons, or milliliters.

* Flour container: This is a container specifically designed to store flour. It could be a plastic jar, a metal can, or a decorative ceramic container.

Could you please clarify what you meant by "flour glass"? I'm happy to help further once I know what you're looking for!