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Materials

• Gas pressure sensor

• 2-liter soda bottle with the bottom cut off

• 3-hole bottle stopper to fit into the top of the 2-liter bottle

• one small balloon and one large balloon

• 3 rubber bands

• Luer-Lock connector or a piece of plastic from a Bic 'round stic grip medium' pen

• 3 regular straws

• meter stick

• piece of string (1 m)