The cooked egg, on the other hand, is solid inside. Because it doesn’t have a stable center of gravity, the egg doesn’t spin smoothly, as a top would, but wobbles about. This makes it so the egg’s center of gravity is constantly changing.
When you try to spin the raw egg, its contents shift around. The contents inside the raw egg’s shell are liquid, so they’re able to move around. One egg spins smoothly while the other wobbles about and is difficult to spin. Note the differences in the way each egg moves. Spin the eggs, one at a time, on a countertop or clean surface. Remove the cooked egg and the raw egg from the refrigerator. This is it so you can’t tell which egg is cooked simply by checking the temperature.ģ. Place the egg in the refrigerator for an hour or more. Drain the egg and rinse it under cool water. To achieve this, let the egg sit in actively boiling water for at least 15 minutes.Ģ. There are several ways to hard-boil an egg, but for the purposes of this experiment we want to make sure the egg is thoroughly hard-boiled. *Note: this part requires adult supervision.
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How to Use Gravity to Tell if an Egg is Cooked Printable Instructions What you’ll need:ġ.
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We can also take advantage of this phenomenon to determine if an egg is cooked, without having to crack the egg open! Having a stable center of gravity makes things like spinning tops possible, or for a tightrope walker to balance on a thin wire. It can be considered as the point on which gravity acts on an object. The “center of gravity”, or the “center of mass”, is the point at which an object’s weight is concentrated. “Gravity” is the force that draws us toward the earth, and it’s responsible for making things fall to the ground when they’re thrown up, or dropped from a distance. How to Use Gravity to Tell if an Egg is Cooked So, while it seems to go against reason, the result is actually adhering to the rules of density. Now, the orange has a higher density, because its mass per unit of volume is goes up. When you take away the peel, the air pockets are removed. These air pockets are empty space, or pockets of no mass that, when calculating the total density, serve to decrease the final result. The holes are essentially tiny bubbles of air. An orange peel is highly porous, meaning that it has lots of tiny holes in it. This seems illogical until you consider the nature of density.ĭensity is defined as mass per volume. In fact, what we observe it that peeling an orange makes it sink. It may seem like peeling the orange should allow it to float even better, since by peeling it we’re removing some of its mass and making it lighter. What happens to the orange now? What’s happening? Place the peeled orange back into the jar. Remove the orange from the jar and peel it.Ĥ. It may seem counterintuitive, but in the following experiment we’ll see that peeling an orange actually makes it sink.ģ. It should stand to reason that peeling an orange, and thereby decreasing its mass, should have little or no effect. Objects that are denser than water will sink, while those that are less dense will stay afloat.īecause it’s less dense than water, an unpeeled orange will float.
Density is defined as mass per unit of volume, and objects with a higher mass-to-volume ratio have a higher density. When trying to guess if an object will float, it’s useful to take into account the object’s density. The ice forms a layer across the surface of the lake, but the lake remains liquid underneath, allowing the plant and animal life to survive through the winter. Ice is far less dense than liquid water, so any water that freezes rises to the top. So why doesn’t a lake freeze solid from the bottom up? The density of water continues to rise until it reaches freezing, but then its density changes again. In nature, this phenomenon is responsible for a process called “turnover.” The sinking of cooler water and rising of warmer water causes the layers of a lake to mix, allowing nutrients such as oxygen to be dispersed throughout. It turned green because it touched some of the hot water on the way down, cooling it down and making it sink. The cooled water in our experiment sank to the bottom because it had a higher density than the heated water. As the water cools down, its molecules slow down and come closer together. This makes the space between them increase, resulting in a lower density. When water heats up, its molecules vibrate and move around. What’s happening?Ĭhanging the temperature of water affects its density.
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