Flask

The utility model provides a flask has solved among the prior art problem that the flask leakproofness does not influence the chemistry experiment accuracy well. This flask includes the flask body, and the upper portion of flask body is equipped with flask mouth and distillation mouth, and the flask mouth is located the central point of flask body puts, the distillation mouth is located one side of flask mouth, flask mouth, distillation mouth all with the inner chamber of flask body is linked together, the flask mouth is including the linkage segment and the funnel section that communicate each other, the linkage segment is vertical cylindrical, the upper end of linkage segment with the junction of funnel section is equipped with first circular arc changeover portion, the lower extreme oflinkage segment with the junction of flask body is second circular arc changeover portion, be equipped with the glass stopper rather than the adaptation in the flask mouth, glass stopper with be equipped with the liquid seal