Science at home! Fun homemade experiments for the little ones. Today we will learn about the Density and Buoyancy!
But before we start, let's review the terminology.
What is Density?
That an object floats or sinks in a liquid depends on the relation between the densities of the object and the liquid. The density of a substance is obtained by dividing its mass by its volume. Volume is the space it occupies and mass is easily measured with a weight or scale. If we divide the mass between the volume density is obtained.
What is buoyancy?
Buoyancy is the ability of a body to stay within a fluid. A simple way to explain it is that for an object to float it is necessary that the push-up is greater than the weight and that depending on the density of the object and the fluid it floats more or less.
Yes now! Let's go with the experiment:
Materials:
- A balloon
- A container to make water
- Water
Procedure 1st Experiment:
- We fill the balloon with water at room temperature and tie it up.
- Then we make cold water in the container
- We place the balloon inside it and observe what happens.
Procedure 2nd experiment:
- Fill the balloon with water at room temperature and close it.
- We put hot water in the container.
- We place the balloon inside the container and watch what happens.
What has happened?
1st experiment:
The density of water depends on the temperature: cold water is denser than hot water. The balloon contains water at a higher temperature than the water in the container, it is less dense and floats.
2nd experiment:
The density of water depends on the temperature: hot water is less dense than cold water. The balloon contains water at a lower temperature than the container, it is denser and sinks.
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