Definition: A measure of the mass of matter contained by a unit volume.

Alright class, settle down, let’s take a look! Today we’re tackling ‘density,’ it’s quite a trick, It tells us how much stuff is packed within a quick little click. The dictionary gave you the key, you see – “A measure of the mass of matter contained by a unit volume,” that's the decree! Let’s break it down with a little rhyme: Mass is how much “stuff” there is to find, Like a pile of blocks or a feather light and kind. Volume is the space it takes up, you know – Think of a box, a ball, or where your pencils go! Now, density is simply this: It’s how much mass for every bit of volume, if you please. Imagine two blocks, made of stone with ease - One small and light, the other big and grand. They might have the same mass, a fact to understand, But the bigger block has higher density, across the land! Think of it like this: More stuff squeezed into less space – that's dense! Less stuff spread out wide - not so dense. Do you have any questions about what we’ve discussed today? Let’s talk it through and make sure everyone understands this concept anew!