In science you will often hear such-and-such is is denser than blah-de-blah. For example water is denser than oil. It might be worded as water has a higher density but it all means the same thing. You might be wondering what density is exactly. If you are read on and I will try my best to explain it in as short and simple a way as possible:
The density of something is how much something weighs per cubic measurement. For example if your wanting to know the desity of a block of wood compared to a brick you would measure their density by how much each cm3 weighs (its mass).
So if you have 1cm3 cubed of wood with a mass of 0.001 g/cm3 and 1cm3 of brick with a mass of 1.72g cm3 you can see that the brick is denser.
Here is a simple and quick experiment that is a good visual example of this...
All you need is a jar of water, a 1cm3 block of balsa wood and a 1cm3 of plasticine and, this last one is optional as you could always do it yourself, a small person to help.
And this is how to do it...
I had to put the link in today because, for some reason unknown to me, I can't get my Youtube videos to link to my blog like I usually would. Any ideas on how to fix that and I would be most grateful.
In the video Honi says the piece of wood is lighter that is correct, it is also less dense than the plasticine. We know this because they are both the same volume. We also discussed, after making this video, that the water was less dense than the plasticine but more dense that the balsa wood which is why the balsa wood floated.