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How to make a Plastic Bottle Barometer



This is an easy project and would make a great science experiment. Using a vacuum inside a plastic bottle with water in it, you can observe the changing air pressure with this simple barometer. Please note, this type of barometer only allows you to see if the air pressure is high or low.

How to make a Plastic Bottle Barometer

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step 1Supplies

Items needed to make this barometer are: 1. A plastic soda or water bottle with lid, size not important! 2. Air Tubing, such as from an aquarium or oxygen use about 1 3/4…

step 2Making the Hole

Using the nail, make a hole in the bottle slightly smaller then the outside diameter of the tubing at the base of the bottle. This is to ensure you get a tight seal. I actu…

step 3Inserting the Tubing

Insert the tubing until the tip is half way into the bottle, and should be resting on the bottom of the bottle. You may need the help of the cooled nail to insert the tubin…

step 4Checking for leaks

Fill the bottle with enough water to come up about an inch on the bottle. If it leaks, dump the water out and apply a good size bead of low-heat glue around the tubing on t…

step 5Attaching the Tubing to the top of the Bottle

Using the rubber band, attach the tubing to the top of the bottle just below the threads, making sure you do not put pressure on the tubing.

step 6Adding Water

Now that your barometer is completed, it's time to add the water! Pour water into the plastic bottle about half way up the bottle. Add desired amount of food coloring to ge…

step 7Afterwards...

Place your barometer in an area where it won't be disturbed too much. Each time you move the bottle, unscrew the lid and retightened the lid to give you the proper vacuum. …

Via Instructables, Published: 2009.10.05


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