How many glasses is 0.5 liters of water?

A glass of water is usually 250 ml or 200 ml. Its volume is usually indicated at the bottom of the glass.

If the volume of the glass is 250 ml, then in 0.5 liter of water 500/250 = 2 glasses.

If the volume of the glass is 200 ml, then in 0.5 liter of water 500/200 = 2.5 glasses.

Answer:

2 glasses of 250 ml or 2.5 glasses of 200 ml.