It is a Four neck Round bottom flask,with one neck at center and other three side necks. These heat resistant borosilicate glass round bottom flasks have four vertical necks - one center neck and three side necks which are 90° apart.This flask is used for heating and boiling of the liquid.It is also used for distillation purposes. It is also used as distilling flask in Rotary evaporators.It is used to contain chemical reactions. One at Centre Neck and Three Angled Side Neck each topped by ground glass connections are used in more complex reactions that require the controlled mixing of multiple reagents.
Four neck flasks are widely used in organic chemistry for carring out heating and distillation task. The flasks are highly resistive to chemical attack and thermal shocks. and round bottom ensures uniform heating. The interchangeable necks can be used for expansion purpose or distillation.
