If the surface of a liquid is plane,then the angle of contact of the liquid with the walls of the container is

If a liquid wets a surface,is its angle of contact acute or obtuse?

$A$ mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is

The meniscus of mercury in the capillary tube is

Why does a raincoat not get wet in the rain?

$A$ liquid is filled in a spherical container of radius $R$ up to a height $h$. At this position,the liquid surface at the edges is horizontal. The contact angle is: