Study on the condition of the siphonage

Abstract：Siphonage is a phenomenon of liquid flowing to a low level through a bent or curved tube of which the top is higher than the liquid surface.Although the pressure on the liquid surface is no matter with the velocity of siphonage flow, it is the necessary condition of the siphonage.The explanation in Cihai dictionary is mistake of "siphonage will happen even if the two water tanks are in the vacuum".The influence of the bent tube length on the siphonage and its flow velocity was discussed, and a cup with a siphon to warn insatiability was introduced.

Keyword：fluid mechanics;siphonage;atmosphere pressure;the explanation in Cihai dictionary;