Mass and matter and often misused by many of us because we believe both words mean the same thing, but of a truth, they do not. Mass refers to a quantity of matter cohering together to make one body, or an aggregation of particles or things which collectively make one body. Mass cannot be seen. It can only quantify. The S.I unit of mass is Kilogram.
There are three known forms of mass. These include inertial mass, active gravitational mass, and passive mass. The matter is defined as anything that has weight and can occupy space. Matter can be seen. The matter is usually measured in different forms. It can be measured in weight, mass, volume, and so on. Matter can also be described based on how it presents in physical form. Matter can be said to be solid, liquid, or gas. I hope you find this information helpful.