Depending upon the condition
of temperature, pressure and its own nature. Matter can
be broadly classified into three states namely solid,
liquid and gaseous state
Matter in the solid state has both a definite
volume and a definite shape. The wood block is solid.
A solid has a certain size and shape. The wood block does
not change size or shape. Other examples of solid are the
computer, the desk, and the floor. The molecules of a solid
are closely packed. There is little space between them.
As such they cannot move freely from one place to another
(translation motion) nor can they rotate (rotational motion).
They can only vibrate (vibrational motion) to and fro about
their fixed position.
Matter in the liquid state has a definite volume
but no definite shape, it takes on the shape of whatever
container it is placed in; Milk is a liquid. It has volume.
Volume means it takes up space. But milk doesn't have a
definite shape. It takes the shape of its container.
Matter in the gaseous state has neither a definite volume
nor a definite shape and expands to fill any container.
You can't see oxygen. It's invisible. It is a gas. A gas
is matter that has no shape or size of its own. Most gases
have no color.