The reason I chose this experiment was, I really wanted to see if i could make the ketchup packet float and sink.
How this experiment worked was, when I put the ketchup packet into the bottle of water, I was squeezing the packet which the air bubbles inside the packet are trapped. Once in the bottle of water, the packet floats. After the cap is on the bottle, i would slightly squeeze the bottle. This causes the packet to sink. When not squeezing the bottle, the packet floats to the top. When squeezing the bottle, I was increasing the density of the packet common it sinks. When not squeezing the bottle, the compressed air expands in the packet and it floats.
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