Is air matter? Does it have mass? Does it have volume? How do you know?

Well i think air is matter, because it is in a state of matter which is gas. It has volume because it takes up space, like when you blow a balloon inside a bottle then it will not expand. But if you poke a hole then it will. I am not sure whether or not air has mas because i do not know how you measure air, bu i think there is mass in air.