How To Make A Barometer For A Science Project?

How does a DIY barometer work?

If the pressure of the air outside the jar is higher than inside (high pressure), it will push down on the balloon and the balloon lid will sink and the straw will point up. If the air pressure outside the jar is lower than inside (low pressure), the balloon will swell outwards and the straw will point down.

How do you make a barometer out of a straw?

Cut a straw at an angle to create a pointer. Tape the straw to the center of the balloon. Make sure the end of the straw ends in the center. On a piece of card draw a sunshine towards the top and a rain cloud towards the bottom.

How do you make a barometer without a balloon?

Construct the Barometer

  1. Cover the top of your container with plastic wrap.
  2. Secure the plastic wrap with a rubber band.
  3. Lay the straw over the top of the wrapped container so that about two-thirds of the straw is over the opening.
  4. Secure the straw with a piece of tape.

How does a barometer predict weather?

Forecasters use changes in air pressure measured with barometers to predict short-term changes in the weather. Changes in air pressure signal the movement of high- or low-pressure areas of air, called fronts. If a high pressure system is coming, you can expect clear skies and cooler temperatures.

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What materials do you need to make a barometer?

Materials Needed for Your Homemade Barometer:

  1. A glass jar (best) or a large metal tin container (like an empty and cleaned large can of baked beans) with straight sides and a wide top/mouth.
  2. A balloon (do not use one you already blew up before)
  3. A few rubber bands.
  4. A tube of silicon glue.
  5. Adhesive tape.

Could water be used to make a barometer?

Water can be used, but water evaporates quickly and is heavier than mineral oil. Mineral oil has a low vapor pressure, so it will not readily evaporate, and it is not as dense as water, so the liquid level in the barometer will rise with a much smaller increase in air pressure compared to water.

Does a barometer work?

The barometer works by balancing the weight of mercury in the glass tube against the atmospheric pressure, much like a set of scales. With an increased weight of air above the reservoir, the mercury level rises to a higher level.

How much does a barometer cost?

The majority of barometers cost between $10 for basic digital models to $50 for large dial-type barometers. However, some ornate options can cost $200 or more.

How do you read a water barometer?

Look at the water in the spout of the barometer. If the water holds steady around the middle of the spout, you’ll have good weather. The water should never dip below this middle amount, so it’s the default position of the water. Check to see if the water creeps up the spout.

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