The density of a liquid is to be determined by an old 1cm diameter cylindrical hydrometer whose division marks are completely wiped out. The hydrometer is first dropped in water, and the water level is marked. The hydrometer is then dropped into other liquid, and it is observed that the mark for water has risen 0.6 cm above the liquid-air interface. If the height of original water mark is 13.6 cm, determine the density of the liquid.