Small drops of water fall at regular intervals from a leaking tap (faucet).
Immediately after a drop has fallen, a student puts an empty measuring cylinder under the tap, to catch the drops.
At the same time, her friend starts a stopwatch. After 50 drops have fallen, she stops the stopwatch.
Fig. 1.2 shows the reading on the stopwatch at the start and finish of this experiment.
Fig. 1.3 shows the measuring cylinder at the finish.