Density of Liquids Lesson for Kids

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  • 0:00 What Is Density?
  • 0:40 Density of Liquids
  • 1:58 Lesson Summary
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Lesson Transcript
Instructor: Michelle Vannoy
In this lesson, we will define density and explore the concept of liquids having different densities. We'll also discuss what happens when liquids with different densities are mixed together.

What Is Density?

Have you ever seen pictures of a fire covering the surface of water? How can water burn when water is also used to put out fires? The reason why fire can float on water is density.

Density refers how much matter is packed into a substance. In other words, are the particles of the matter in a substance packed in close together and tight, or are they far apart? The tighter the particles are packed, the denser the matter is. When we measure density, we write it out as grams per unit of volume--usually grams per cubic centimeter (g/cm^3).

Density of Liquids

All liquids have densities. In liquids, the density determines whether or not something will sink or float in that liquid. Take, for example, water. A substance (whether it's a liquid or otherwise) with a greater density than the water will sink. A substance with a lower density will float. If you decide to pour several different liquids into a bucket, you could compare the densities of the liquids by looking at where they sit in the bucket.

Let's take a look at the densities of some everyday household liquids:

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