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PSPKK12

Sink or Float Science Experiment Using Balloons

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The science of density is a simple concept, but there are so many things to learn in this important scientific concept. This classroom-friendly science lesson will show kids the varying density of water, oil, and dish soap suspended in cups of water. Children will have a lot of fun exploring density in this fun hands-on science project. The sink or float science experiment uses balloons, which adds an element of fun for young kids. Tie this lesson into other physical science lessons, or use it to illustrate how fish move through the water.

Dropping water filled balloons into different liquids to see if they sink or float

Getting the Sink or Float Science Experiment Ready

Setting this experiment up is super easy, and it takes very little advanced prep. You will need:

This fun sink or float science experiment explores the density of liquids with a fun twist by using balloons filled with various liquids.
  • 3 Balloons
  • Dish soap
  • Water
  • Oil
  • 3 Plastic cups
  • Permanent marker
  • Sink or float printable

Write the words “Water,” “Oil,” and “Soap” onto the three cups so the kids can tell which balloon goes in which cup. Fill one balloon with 1/2 a cup of water, one with 1/2 a cup of vegetable oil, and one with 1/2 a cup of dish soap. Doing this in advance will save time and reduce the mess of this project.

Be careful not to get too much air into the water balloon or the dish soap balloon or they won’t sink properly and the experiment won’t have the right results.

Doing the Sink or Float Science Experiment

This fun sink or float science experiment explores the density of liquids with a fun twist by using balloons filled with various liquids.

Fill each cup with water. Show the balloons to the kids and tell them what each is filled with. Let them think about whether the balloons will rise or sink when placed in the water. Have them filled out their hypothesis in this printable and record their results along the way.

Drop the balloons into the water one at a time. Watch the kids react and ask them if their hypothesis was correct or incorrect and have them record that data on their sheet.

This fun sink or float science experiment explores the density of liquids with a fun twist by using balloons filled with various liquids.

Once all the balloons are in the water, discuss density and how objects with different densities react in water. Have the kids think of other things that float in water and other things that sink in water.

The Science Behind the Sink or Float Experiment

This simple experiment ties into density. Water, dish soap, and oil all have different densities, which will determine if they sink or float. Oil is less dense than water, dish soap is more dense, and water will have the same density as the surrounding water.

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Filed Under: Experiments Tagged With: Kindergarten, Pre-K, Preschool, Science

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Reader Interactions

21 Comments

  1. Laura Trenholm

    November 6, 2017 at 6:48 am

    I really love your sink or float science experiment. Do you still offer the printable?? 🙂

    Thank you!

    Reply to this comment
    • Jennifer

      January 15, 2018 at 10:03 am

      Yes! Try downloading now. Thanks!

      Reply to this comment
    • Daquan Demarcus Smith

      December 3, 2021 at 10:09 am

      I love it to it help me for my school project.

      Reply to this comment
  2. Ashlynn

    January 16, 2019 at 3:50 pm

    I love this project! I found it on pintrest. I am 10 years old and in fifth grade. I am doing this expierement for the science fair. I hope i win! The science fair isn’t until Feb. 7 and its only Jan. 16, but im working on it already! It sounds fun and intresting.

    Reply to this comment
    • Jennifer Hamilton

      January 17, 2019 at 3:18 pm

      Hi there Ashlynn! This is so exciting!!! I’m glad you’re able to use this experiment. Please let me know how it goes!!!!

      Reply to this comment
  3. Daquan

    December 3, 2021 at 10:11 am

    I love it it help me for my school project.

    Reply to this comment
  4. Deshawn Finazzo

    April 24, 2022 at 5:02 pm

    Some really interesting points you have written.Assisted me a lot, just what I was looking for : D.

    Reply to this comment

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