I do not have a superman complex; for I am God, not Superman!
the glass is always 100% full. Approximately 50% of its volume is full of dihydrogen monoxide and some dissolved solutes, and approx 50% a mixture of gasses known as "air" which contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases.