sentence: Gravity stretches the stream, then surface tension pinches it into spheres.
sentences_before: Formation of drops occurs when a mass of liquid is stretched. The animation shows water adhering to the faucet gaining mass until it is stretched to a point where the surface tension can no longer bind it to the faucet. It then separates and surface tension forms the drop into a sphere. If a stream of water were running from the faucet, the stream would break up into drops during its fall.
concept_name: gravity
headings: Surface tension Effects in everyday life Water
categories: Basic physics ideas‏‎ Fluid mechanics