The Plastic Bag Experiment

Every  Friday we can do science or mandarin workshops.

Today we are going to talk about science.

This Friday (31.7.2015) we did an experiment where we put a clear plastic bag over our wrist and sealed it with tape. We had to sit down and play a game by not moving much for 7 minutes. By the end of about 7 minutes we all had a bag that was very moist around the inside. Some people had really sweaty hands and the bags looked foggy.

Keith took us out for a game (we still had our plastic bags on) and after the game our bags had much more moisture than when we were sitting inside. There were droplets of water inside and not just a fog.

The reason that this was caused was because the moisture was sweat. When we were inside it was less hot because we were sitting down and not doing much. Outside we

were playing a game which makes us more hot from running around. Sweat is caused when

you are hot and your body needs to cool down. The body produces moisture (sweat).

By Isobel and Eliza

Some students noticed that the hand in the plastic bag was much warmer than the hand that had contact with outside air. Others thought their hand stinks after being in a plastic bag for half an hour - yuck.