00:01
Density is a measure of how closely packed particles are.
00:06
So for example, let's say we have a rock and a sponge, and they're both the same volume.
00:11
It's the same, the sample sizes are the same.
00:15
So if i were to, let's say this is my rock sample and this is my sponge sample.
00:20
If i were to zoom in at the atomic level, the rock particles, we'd have a lot of them packed together.
00:28
It's very dense.
00:29
I would just repeat this pattern throughout the environment.
00:32
Entire rock sample.
00:33
So it's very dense because there's a lot of particles.
00:37
Let's say in this given space there are a hundred, this given volume, there are 100 particles.
00:46
Now this sponge sample, which is the same size, is not going to have as many particles.
00:51
There's a lot of air in between.
00:54
So let's say it's 10 particles.
00:58
So the volume might be the same.
01:01
Let's say this is a 10 cubic centimeter sample of rock and this is a 10 cubic centimeter sample of sponge, this would have 100 particles in the 10 cubic centimeters.
01:15
This would have 10 particles in the 10 cubic centimeters.
01:20
So if you actually did this math out, this would be 10 particles per one cubic centimeter.
01:30
This would be one particle in one cubic centimeter.
01:35
So that's just dividing out the numbers.
01:38
So this, the rock, is more dense than the sponge.
01:45
The sponge is still solid.
01:46
It's just there's a lot of tiny air things like nitrogen, oxygen, all the things that make up the air.
01:56
Whereas the rock, they're just so much more tightly packed...