# How Does Surface Tension Balance Small Objects on Water Surface?

When small object such as needle is put on the surface of water it displaces small amount of water which creates a depression under the object. Such depression increases surface area of the water because of which surface tension tends to decrease it.

Explanation why surface tension balances the weight of an object is that integration of surface tension along the contour or wetted length of the object yields that there is an resultant upward force balancing weight of an object if weight isn't bigger than that resultant. This upward resultant is essentially consequence of curved depression or contour under the object which I already mentioned.

Why is surface tension acting on the object since surface tension is a tendency to decrease surface area of the liquid because of which it should act on the liquid not the object?

• A simple analogy in 2 dimensions: a weight is suspended on the middle of a rubber band supported between two immovable points. The upward force on the weight is entirely due to the tension on the rubber band, which has an upward vector component when the rubber band is displaced such that it has upward facing curvature.
– g s
Commented Oct 6, 2021 at 19:25