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.
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.
Related: More science projects
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.
Supplies Needed for Egg Spin Test
- Eggs – raw & boiled
- Flat surface
Egg Spin Test Instructions
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?
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.
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
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!
- Eggs – raw & boiled
- Flat surface
- Set your egg on a flat surface.
- Gently grip the egg between your thumb and fingertips and twist to gently spin the egg.
- While the egg is spinning, touch the egg lightly to stop the spinning and lift off your finger.
- FOR HARD BOILED EGGS: the egg will remain still. FOR RAW EGGS: the egg will attempt to continue spinning.
Many people think of an “egg test” as whether to tell if you have a fresh or spoiled egg without cracking the shell. Since we are running all sorts of science experiments around the un-cracked egg today, why not look at that too!
Remember, simple egg freshness tests aren’t always accurate and can sometimes give you the wrong result as to egg freshness. To really make sure your egg is fresh, the best thing to do is check the expiration date on the carton and store the eggs properly.
Egg Test Methods
- Egg float test: Place the egg gently in a glass filled with water. If the egg sinks to the bottom, it is fresh. If the egg floats, it is not fresh.
- Egg sniff test: Smell your egg. If it has an unpleasant odor, it is not fresh.
- Egg crack test: While your egg is on a flat surface, crack the shell and observe your egg. If you can see the yolk is round and upright, the egg is fresh. If you see the yolk is flattened with thin, spread out white around it, it is not fresh.
- Egg shell test: Hold your egg up to the light. If the shell appears thin and fragile, the egg is likely older and not fresh.
More Egg Science Experiments for Kids
- Try the egg drop challenge idea – one of the best egg science fair ideas!
- Squeeze egg in hand experiment shows the balance eggs have between being strong and being fragile.
- How to make scrambled eggs inside the shell.
- Egg in vinegar experiment to make a naked egg.
- Hatching supermarket eggs?
- Did you know that traditional paints were actually egg paint?
Were you able to use the egg spin experiment to see if your egg was raw or boiled? Did it work?
Nice info. I can differentiate which one is raw egg and which one is boiled egg now. Thanks
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.
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.
this is a fun experiment!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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.