5. Cartesian Diver
Materials Needed: Condiment packet and a two-liter bottle.
The first step of this experiment is to place the condiment packet in the bottle, fill it up to the top and screw the top. The packet needs to float and if it sinks, you will need another packet. Ketchup packets seem to work great, but it all depends on the country you live and the local air pressure. However, if the packet floats, squeeze the bottle hard for the package to sink. Mayonnaise packets cannot sink no matter how much you are squeezing. When you find the right package it will float when you aren’t squeezing and it will sink with just a little squeeze. How cool is this? Cool enough to take the fifth place on this list of 10 simple physics experiments with everyday materials.
