Chemistry is the study of MATTER. Matter is made up of substances which consist of physical and chemical properties. A property is defined as the characteristics of substances called elements. Elements are made up of atoms and molecules. When these elements are exposed to certain conditions, their inertia states and behaviors may change.

The states of Matter:
There are three forms called the states of Matter which are gas, liquid and solid.
A gas a.k.a.|also known as vapor has no fix volume or shape, rather, it conforms to the volume and shape of its container. A gas can be compress to occupy a smaller volume, or it can expanded to occupy a larger volume.
A liquid is measurable and has a distinct volume independent of its container but has no specific shape. It assumes the shape of the container it occupies.
A solid has both a definite shape and a definite volume.