The volume of 500 ml of water is equivalent to half a liter or 0.5 liters. In terms of a standard glass, it typically holds around 250 ml to 300 ml of liquid. Therefore, 500 ml of water would fill approximately one and a half to two standard glasses. However, the exact amount that a particular glass can hold may vary, so it's always a good idea to check the capacity or markings on the glass itself for a more accurate measurement.