Pitch drop experiment is one of the world's longest experiments. The University of Queensland in Australia has started the experiment in 1927.

In 1944, the experiment was repeated at a different place. This time, the experiment took place at a physics lab at Trinity College, Dublin. The experimenter took lumps of tar and heated them.

After heating them he put the material into a funnel, which was then put into a jar and later into a cupboard. Main aim of the experimenter to wait for decades was to see the pitch that should shatter like a glass.

Though it seems to be an easy experiment, but it is not. It is very difficult to maintain the temperature of the tar. It can leak from the funnel and can even drop from the jar.

To talk about the University of Queensland's experiment. This experiment has witnessed the pitch to drop by eight times. Experts said that pitch takes its own time to go through the process.

When both the experiments took place, there was no videotaping facility. Due to which, onlookers have to patiently wait to see the pitch of the tar as they have to ensure that they do not miss out the same.