Title: Diving Ketchup
Source: http://www.stevespanglerscience.com/experiment/00000090
Target Age: Elementary and Middle School aged students
Materials Required:
2. Scrunch the packet in half lengthwise and carefully push it into the soda bottle. Fill the bottle full to the brim with water and screw on the cap. Squeeze the sides of the bottle and hold the squeeze to make the packet sink. Let go and it rises.
Materials Required:
- Plastic soda bottle (1-liter size works great)
- Ketchup packets from a restaurant
- Tall drinking glass
- Soda bottle cap
- Water
Demo Time Required: 10 minutes (or however long you want to perform the experiment!)
Description:
Description:
1. First, you'll need to perform a œfloat or sink test to see how the ketchup packet works. Fill the bowl with water and drop the packet into it. If it floats, great! If it sinks to the bottom, no sweat. This shows that atmospheric pressure in the packet is pressing hard enough on the air bubble inside the packet to sink it. If this happens, you get to make more trips to your favorite fast-food restaurant to find a ketchup packet that just barely floats!
2. Scrunch the packet in half lengthwise and carefully push it into the soda bottle. Fill the bottle full to the brim with water and screw on the cap. Squeeze the sides of the bottle and hold the squeeze to make the packet sink. Let go and it rises.
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