Why do peeled oranges sink

The mass of something is essentially the amount of matter, or stuff in it. I like to think about a bowling ball versus a soccer ball. You know that as soon as you pick one up or drop it. Do you remember that there is a link between mass and volume? The density of an object is its mass divided by its volume.

Since a bowling ball has a greater mass for the same volume, it has a greater density than the soccer ball. Less Dense If the mass of an object is less than the mass of the water it displaces, the object will float. Since both the object and the displaced water have the same volume, but the object has less mass, the object is less dense than water.

So an object that is less dense than water will float. Same Density If the mass of the object is the same as the mass of the water it displaces, the object will float but be submerged in the water. Greater Density If the mass of the object is greater than the mass of the water it displaces, the object will sink. Since both the object and the displaced water have the same volume, but the object has more mass, the object is denser than water.

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In this easy science experiment, kids explore and test density while learning more about buoyancy. A materials list, printable instructions, and a demonstration video are included along with a simple explanation of how the experiment works.

Step 1 — Begin with 2 empty glasses or containers. Note: They must be big enough to put an orange into. Step 3 — Slowly and carefully place an orange in one of the containers. What happens to the orange? Does it float or does it sink? Step 5 — Slowly and carefully place the peeled orange in the second container. This increase in buoyancy helps the orange become less dense than the water, so the orange will float in the water. Think of the pockets of air in the orange peel are like tiny floatation devices for the orange.

On the other hand, when you remove the peel from the orange, you are in fact making it lighter, but you are also removing those tiny air pocket floatation devices. Therefore, the orange without the peel is denser than water and it sinks.