For demonstrating Bernoulli’s principle that any restriction in ﬂuid ﬂow results in increased speed and decreased pressure. Comprised of borosilicate glass tube 18cm (7in) long and 18mm (3/4in) in diameter with a constriction in the centre and three vertical openings in different sections. Includes three glass manometer tubes and rubber connecting tubes for measuring pressure at three locations. Ends are ﬂared. 3450-00 Note: Venturi tubes of other dimensions and speciﬁc wall thickness can be supplied.