Is glass inert?

The dense Si-O network make it very resistant. However, HF will attack it and in fact is the etching agent used.

As far as anyone can tell... yes. There has not yet been found an example of glass that is not glass.I say nay, glass is melted sand, so glass is sand.

Look for a "bug" ... a small logo that's placed in the corner of safety glass to let you know that it really is safety glass (you can see a sample one by looking at the front windshield, which is...

it depends on the auto maker

Generally, "a glass of water" refers to 8 ounces.