Average densities means that we use the density equation of the total mass over the total volume. Find out about the average densities of the inner versus the outer planets with help from an educational professional in this free video clip.

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Average densities means that we use the density equation of the total mass over the total volume. Find out about the average densities of the inner versus the outer planets with help from an educational professional in this free video clip.

Part of the Video Series: Outer Space

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Hi, my name is Eylene Pirez, and I'm an astrophysicist, and this is, "What is the average densities between the inner planets versus the outer planets?" So let's talk about average densities. Average densities means that we use the density equation of the total mass over the total volume. So it generally is a measure of how many grams can we find in a cubic meter if you were to take a cubic meter off a planet and a cubic, I mean a cubic centimeter, excuse me. And then this is what it will look like. If we take a little cube and each side is one centimeter, we will count how many grams inside this cube and we will give that the average density. So let's look at the inner planets, so for Mercury, we can find 5.4 grams per cubic centimeter. Venus is 5.2. Earth is 5.5. Mars is 3.9. So fairly heavy, that means you can find 5 grams within a cubic centimeter, that's a lot. Let's look at the outer planets. So Jupiter is only 1.3. Saturn which is the least dense is 0.7. Uranus is 1.3 again and Neptune is 1.6 and this is the average densities of the inner planets versus the outer planets. As you can see, the average density of the outer planets is a lot smaller than the average densities of the inner planets. My name is Eylene Pirez and I'm an astrophysicist.