The angle of contact for pure water and clean glass surface is

The angle of contact of pure water and clean glass is ____.

The value of the angle of contact for pure water and mercury with the surface of glass respectively-

For tap water and clean glass, the angle of contact is

Water rises up in a glass capillary upto a height of 9.0cm , while mercury falls down by 3.4 cm in the same capillary. Assume angles of contact for water glass and mercury glass 0^(@) and 135^(@) respectively. Determine the ratio of surface tension of mercury and water (cos 135^(@)=-0.71) .

Water rises up in a glass capillary upto a height of 9.0cm , while mercury falls down by 3.4 cm in the same capillary. Assume angles of contact for water glass and mercury glass 0^(@) and 135^(@) respectively. Determine the ratio of surface tension of mercury and water (cos 135^(@)=-0.71) .