Turn the bottles upside down so that the bottle containing the water is on top. Observe what happens. Now hold the lower bottle with one hand and the upper bottle with the other hand. Support the lower bottle while quickly moving the top of the upper bottle in a clockwise direction. Stand the bottles upright, with the empty bottle remaining underneath.
Questions Answer the following questions in the spaces provided.
The water inside the upper bottle swirls, forming a funnel shape as it pours into the lower bottle. You have probably seen this happen when you let water out of a bath. The swirling air is then tilted upwards to form the tornado. Air flows into the tornado through the bottom and out through the top. Tornadoes are also called twisters.