The teacher blew through the other end of the rubber tubing. The icing sugar came into contact with the flame. There was a loud explosion and the lid was blown off the tin.?

The teacher's experiment with the rubber tubing and icing sugar took a dangerous turn when the sugar ignited upon contact with the flame. The rapid combustion led to a loud explosion, forcefully ejecting the lid off the tin. This unexpected reaction highlights the volatile nature of certain substances when combined with heat, serving as a reminder of the importance of safety in experimental settings.