Question

Write the is value of angle of contact for concave nature of liquid?

Answer 1

Explanation:

If θ is acute angle, i.e. θ<9o°, then liquid meniscus will be concave upwards. If θ is 90°, then liquid meniscus will be plane. If θ is obtuse, i.e. θ>9o°, then liquid meniscus will be convex upwards. If angle of contact is acute angle, i.e. θ<9o°, then liquid will wet the solid