OK, so we say that liquids and gases are made of moving particles but how do we know it? Just look at the droplets of fat in the short clip on the left, or download the longer clip. All of them are shaking about randomly and the smaller droplets are moving more than the larger ones.Einstein worked out that this was because the water was made of small fast particles that we can't see. Watch this video to see why. Now 7F are all scientists like Einstein.
