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DOG-FRIENDLY WATER FEEDER

Make a self-filling water bowl for pets using air pressure

Suitable For

Grade 3

Difficulty

2

Time Required

 <2 Days

Supervision

Advised

What’s it about?

Ever forget to fill your beloved dog’s water bowl? For those lazy ones amongst us, it might be useful to know that simple atmospheric pressure allows a water bowl to automatically refill itself from an upright container, as you will see in the following science experiment:

Topics covered

Pressure, Air pressure (Atmospheric pressure)

What will I need?

  • FLAT BOTTOM WATER BOWL
  • LARGE JAR
  • PIECES OF WOOD
  • TAP WATER
  • STICKY TAPE
  • ICE CREAM TUB LID

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

In this science experiment the atmospheric pressure exerts a force on the water surface in the bowl and keeps the jar with water filled. There is less pressure inside the bottle because there is less air inside, so the water level inside is higher. When your pet drinks water from the dish, more air flows into the jar increasing the air pressure inside and forces the water level down, while always keeping your pet’s water bowl filled (until as the water in the jar is finished).

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This particular science project can be found in any of the following Experiland e-books:

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