Matter

Almost all of the macroscopic objects exist in three phases or three forms—solid, liquid and gas.
A solid is a substance that has a fixed volume and a fixed shape. A liquid has a fixed volume but does not have a fixed shape. A gas has no fixed volume or shape. One substance can take the
form of all three. For example, ice is a solid form of water, water is in liquid form and the water
vapor is in gas form. If we look at the atomic arrangements of the three states, atoms in solids
are bonded fairly firmly together. In liquids, the atoms are more randomly arranged and a little
bit further apart. Gases have much more randomly arranged atoms than either liquids or solids.