Mass, volume and density

 Here you have the definitions:

Matter makes up everything you can see (plants, rocks, animals, etc). 

It also makes up substances you cannot see (the air you breath)

Matter can be a gas, liquid or solid. 

What is mass? It is the amount of matter of an object. We use grams (g) and kilograms (kg). 1kg=1000g.

What is volume? It is the amount of space of an object. We use mililitres (ml) and litres (l). 1l=1000ml.

What is density? It os the relationship between the mass and volume of an object (the space it occupies and the amount of matter it contains).

Density explains why some objects float: