Why does it happen?
Milk is mostly water, and water has a property called surface tension, this is because all the water molecules are strongly attracted to other water molecules, but not to air, so they try to get away from the surface of the drop, making the surface as small as possible, this is why raindrops are approximately spherical - the shape with the least surface for its volume.
This means that the surface of water, or milk, is always trying to shrink.
Why does it happen?Milk is mostly water, and water has a property called surface tension, this is because all the water molecules are strongly attracted to other water molecules, but not to air, so they try to get away from the surface of the drop, making the surface as small as possible, this is why raindrops are approximately spherical - the shape with the least surface for its volume.This means that the surface of water, or milk, is always trying to shrink.
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