Capillary bridges

Capillary bridges are like tiny little water bridges that form between two surfaces that are very close together. Imagine putting two pieces of paper very close to each other so that they almost touch, but there is still a tiny space between them. Now imagine adding a drop of water to that space. The water will form a tiny bridge between the two pieces of paper.

This happens because of something called surface tension, which is like a force that makes water molecules stick together. When two surfaces are close together, the surface tension of the water causes it to climb up the surfaces, almost like it is trying to escape the tiny space. This creates a bridge of water between the surfaces, and it can be very strong, even able to hold up small objects!

Capillary bridges are important in many areas of science and engineering, from understanding how water moves through soil to designing tiny machines that can use capillary forces to move things. So even though they are tiny and hard to see, capillary bridges are pretty cool!