Egg Spin Test to Find Out if an Egg is Raw or Boiled

Did you know that you can tell whether an egg is raw or boiled without cracking the shell? It is called the egg spin test and it is really easy and fun to try at home or in the classroom.

Egg Spin Test to Determine if egg is cooked or raw - Kids Activities Blog - two eggs shown one on yellow background with the word "boiled" and the other on a purple background with the word "raw"
You can tell if an egg is boiled or raw without cracking it!

How to Tell if An Egg is Hard Boiled

My kids (and I) were excited to learn about this simple egg experiment which came in handy in our home recently. As we were preparing for some serious egg decorating, we lost track of which bowls contained raw egg or boiled egg.

Without having to crack an egg, we used egg physics to help us solve our problem in the form of the egg spin test.

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Egg Spin Experiment: Raw vs. Boiled Egg

I did a little research and found a simple way to figure out which of the eggs were boiled and which of the eggs were still raw with a simple spin an egg.  This helpful egg hack is also a great way to teach a little science lesson for the kids.

Egg Experiment for Kids: Raw Egg or Boiled Egg?

Supplies Needed for Egg Spin Test

  • Eggs – raw & boiled
  • Flat surface

Egg Spin Test Instructions

Egg spin experiment is an egg cooked or raw - Kids Activities Blog - lines of eggs on blue background with one cracked egg
Step one is to place egg gently on a flat surface.

Step 1 – Find a Test Surface

Place the egg in question on a flat surface.

Step 2 – Spin an Egg

Grip it between your thumb and fingertips, and then gently spin it. Emphasize “gently” with your kids, because a raw egg spinning off the table can get messy…I speak from experience!

Step 3 – Stop the Egg Spin

While the egg is spinning, touch the egg lightly enough to make it stop spinning, and then lift your finger off.

Results of Spin Test: Is it a Boiled Egg? Is it a Raw Egg?

If the egg is hard boiled:

If the egg is boiled, the egg will stay in place.

If the egg is raw:

If the egg is raw, it will amazingly start spinning again.

So what in the world is going on?

Egg Experiment works because of egg physics  Kids Activities Blog - egg on yellow background
Let’s look closer at why this works!

This Egg Spin Experiment Works Because of Egg Physics!

This is a perfect example of inertia and Newton’s Law of Motion:

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Newton

So, something in motion will stay in motion until acted upon by another force.

1. Egg and Shell Spin Together When Egg is Raw

The egg shell and its content are spinning along together. When you stop the egg from spinning, you stop the egg shell from moving, but the inside of the raw egg is liquid and just keeps spinning around.

Eventually, the friction of the egg shell will slowly stop the liquid center from spinning, and the egg will come to rest.

Egg Experiment for Kids: Raw Egg or Boiled Egg?

2. Egg Mass is Solid when Egg is Boiled

Inside the hard boiled egg, the mass is solid. When the egg shell stops, the center of the egg cannot move anywhere, so it is forced to stop with the egg shell.

Try this egg experiment with your kids, but before you explain to them how it works, ask them for a theory on why the raw egg or boiled egg spins differently.  

How to Tell if an Egg is Hard Boiled or Raw

Egg Spin Test to Determine if egg is cooked or raw - Kids Activities Blog fb

This simple egg spin test can check whether an egg is hardboiled or raw without cracking open the shell. This is a fun science experiment for kids and an essential kitchen skill for those who might have mixed up some hardboiled eggs with their raw ones in an egg carton!

Active Time 2 minutes
Total Time 2 minutes
Difficulty easy
Estimated Cost $0

Materials

  • Eggs – raw & boiled

Tools

  • Flat surface

Instructions

  1. Set your egg on a flat surface.
  2. Gently grip the egg between your thumb and fingertips and twist to gently spin the egg.
  3. While the egg is spinning, touch the egg lightly to stop the spinning and lift off your finger.
  4. FOR HARD BOILED EGGS: the egg will remain still. FOR RAW EGGS: the egg will attempt to continue spinning.

More Egg Science Experiments for Kids

Egg Drop challenge and egg drop experiment ideas for kids from Kids Activities Blog - egg shown wrapped up in bubble wrap and washi tape to be dropped
Let’s do more egg experiments!

Egg Drop Experiment for Kids

One of my favorite experiments in 6th grade science was the Egg Drop Experiment! Our teacher gave us almost two week’s worth of class time to work with a partner and research the best way to safely contain our raw egg so that it wouldn’t break when dropped from the stairwell of the top floor of the school. 

See Kids Activities Blog egg drop challenge ideas that work great for homeschool, classroom or the science fair.

Were you able to use the egg spin experiment to see if your egg was raw or boiled? Did it work?

5 Comments

  1. Nice info. I can differentiate which one is raw egg and which one is boiled egg now. Thanks

  2. My Science teacher at our preschool center did this experiment not too many weeks ago. Very interesting experiment and easy concept for 3-5 y/o’s to understand. I didn’t have pictures so I didn’t post it on my blog. Thanks for posting it here.

  3. Sue Fromm says:

    Mom’s trick> Just spin the egg . A hard boiled egg spins quickly; a raw egg spins slower and erratically. This is a nice extension on the theme though.

  4. This is a very informative experiment to find out the raw and boiled eggs. My son already demonstrated this experiment on his science experiment in the school.

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