Weather Predictions
What You Did
You built a barometer
Intended Results
It can take some time to see results for this experiment, since it depends on the weather.When the air pressure drops, like when there’s a rain storm, the air in your cup should be higher than the air around it, inflating the balloon a bit, and causing the straw to tilt lower than your starting mark.When the air pressure rises, the air in the cup should be equal to or lower than the air around it, deflating the balloon, and causing the straw to return to either your starting mark or rise above it.
Unintended Results
If you built your barometer on a rainy day, you may only get higher readings. If you built your barometer on a high pressure day, you may only get lower readings
Keep Tinkering
Try building a smaller version with a spice jar and a toothpick
Explored Concepts
air pressure