Why can't we see air ?

Why can't we evercome the uncertainty predicted by hesisenherg principle by building more precise devices to reduce the error in measurment below the h//4pi limit ?

Why can we not use an aqueous solution of sodium chloride to isolate sodium metal by electrolysis ?

Although we cannot see air, we can . . . . . . . . . . . . . . It.

Why we use air columns in musical instruments ?

Why can't the vectors be added algebraically ?

Why don't we observe the wave properties of large objects such as a cricket ball?

If a classroom door is open just a small amount we can hear sounds coming from the room but we can't see what is going on inside the room because

Why do we see a rainbow in the sky only after rainfall?