What is Density?

Density is an interesting scientific subject that is sometimes a little bit hard to understand. What is density? Sometimes dense means somebody has a hard head. But in science, dense tells how closely “packed” or “crowded” a particular thing is.

Here’s a way to understand it better. You’ll need two sandwich size zip close bags and a big bag of cotton. Loosely fill the first bag with cotton. Count how many cotton balls you put in.

The bag is full of cotton, right?

Now, take a second bag, and put twice as many cotton balls into it.

It’s full of cotton, too.

Both of these bags are now full, but the second one is more densely packed than the first. It’s also heavier.

That’s what density is.

Now try this cool science project about the density of liquids. Take a jar, and add 1/2 cup oil, 1/2 cup water, and 1/2 cup syrup. Add them all at the same time. What happens? Oil is less dense than water. And syrup is more dense than water. As you can see.

There’s a lot more that you can discover about density. The concept of density can turn into a cool science project.

Read about density at Watch This! Science Projects.

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About sciencemom

My name is Kayla Fay, and my husband and I have four sons. We’ve turned in over 25 science projects. We remember the disappointment of having an experiment fail. We know how frustrating it is to search for a good project at the last minute. The five 24 Hour Science Projects have experiments our sons have completed successfully. The project guides will help you have the same success with your science experiment!