States of matter are the distinct forms that different phases of matter take on. Solid, liquid,and gas are the most common states of matter on Earth. Matter can exist in several distinct forms which we call phases. We are all familiar with solids, liquids and gases. Whether a substance is a solid, liquid or gas depends on the potential energy in the atomic forces holding the particles together and the thermal energy of the particle motions.
Solid
Solids are the thickest forms of matter. All the molecules in a solid are tightly fitted together, so the molecules can’t move around very much. Solids are made up of different parts or compounds. Unlike liquids or gases, solids stay the same shape.
Examples of solids: wood, rock, and metal
Liquids
Liquids are an in-between state of matter. They can be found in between the solid and gas states. They don't have to be made up of the same compounds. If you have a variety of materials in a liquid, it is called a solution. Liquids is that they are difficult to compress. When you compress something, you take a certain amount and force it into a smaller space.
Liquids cannot be compressed as the molecules are still close together. When a liquid is heated molecules vibrate and move apart. When heated molecules gain more kinetic energy and move apart and evaporation occurs.
Examples: Juice, water, blood
Gas
The molecules of a gas are far apart. The inter-molecular force of attraction is negligible and they have no fixed freedom of motion. Hence gases have neither fixed shape nor volume. They completely occupy the container and take the shape and the volume of the container.
Example: Air, Balloon
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