The Floating Egg Experiment
It’s always so much fun to do a cool science experiment with your kids.
I especially love doing egg experiments because even though they’re mostly easy, they’re also usually pretty dramatic.
The floating egg experiment is a good example.
We did this experiment as part of our ocean unit. Probably half the class correctly hypothesized that the egg would float in the salt water but everyone was excited to see it actually happen.
Here’s the sheet (you can download it below) that I use with my class.
As a class, we fill out the sheet together.
I tell the kids that we’re going to make an egg float in liquid. We read the hypotheses together and each child chooses the one they like the best. I also always have them circle or underline their choice using a felt pen. You would NOT believe how many of my little scientists erase and change their hypothesis after the experiment is finished!!
After the hypotheses have been chosen, I give everyone a paper egg. They cut it out, write their name on it and decorate it, if they like. Then they glue the egg onto a large piece of chart paper indicating their chosen hypothesis.
I save all these chart papers and refer to them throughout the year. They’re great to use in math lessons where you can talk about graphs, more than, less than, mode, etc.
Here’s an example of what your class graph might look like:
The next step, of course, is to complete the experiment (as described in the worksheet above). After the solutions are made we carefully place an egg in each cup.
It’s always so much fun to see the looks on the kids’ faces when the egg floats in the salt water!
To finish up, the children draw a picture of their observations (I often model this on the board) and we talk about the results and the reasons why the egg floated (the salt water is slightly more dense than the egg).
DOWNLOAD: PDF file for The Floating Egg Experiment
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If you’d like to extend the experiment a bit, watch this video. The “Crazy Russian” (that’s what he calls himself) shows how you can suspend an egg in the middle of a glass (with water below and above the egg). It’s very cool!
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