So Much Pressure!

So Much Pressure! is a science project that teaches kids how to make their very own barometer. You and your kids can make a water barometer that will show you the changes in the air pressure.

What You'll Need:
  • Ruler
  • Modeling clay
  • Water
  • Bowl
  • Clear plastic bottle
  • String
  • Paper
  • Pen or pencil
Learn About So Much Pressure!

Step 1: First, stick a ruler into a lump of modeling clay. Then put the clay and ruler in the bottom of a bowl. (The ruler should be standing up straight.) Put about three inches of water into the bowl.

Step 2: Next get a narrow, clear plastic bottle. Fill it about 3/4 full of water. Cover the top of the bottle with your hand, turn it upside down, and put it into the bowl next to the ruler. Once the bottle top is under­water, you can take your hand away. With the bottle still standing upside down, tie the ruler to the bottle with string.

Step 3: Cut a strip of paper about four inches long. Make a scale on it by making a mark every 1/4 inch. Halfway down the strip, make a longer line to show the halfway mark. Tape this strip of paper to the bottle with the halfway mark at the same level as the water in the bottle.

Step 4: Now you have a water barometer. The water in the bottle will move up and down as the air pressure changes. As the air pressure in the room increases, it will push down on the water in the bowl, forcing water up into the bottle. Then you can see yourself that the air pressure is high. If the air pressure is low, the bowl's water will rise, the bottle's water will sink, and you'll get a lower pressure reading.

Testing the Air is a science project that teaches kids how to measure environmental pollutants. Learn how to prepare this science project on the next page of science projects for kids: weather and seasons.

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