States of Matter - The Solid State

Matter exists in three primary physical states: solid, liquid, and gas. These states differ based on several factors, such as intermolecular forces, kinetic energy, and interatomic distances. Solids are the most common and easily recognisable form of matter, making up many objects we see and use daily. Although there are other states of matter (like plasma and Bose-Einstein condensates), we will focus on the three main states for now, especially the solid state.

Examples of solids are common table salt, table sugar, water ice, frozen carbon dioxide (dry ice), glass, rock, most metals, and wood.

• When a solid is heated, the atoms or molecules gain kinetic energy. If the temperature becomes sufficiently high, this kinetic energy overcomes the forces that hold the atoms or molecules in place. Then the solid may become a liquid or a gas, or it may react with chemicals in the environment.
• Water ice is an example of a solid that becomes liquid when it is heated gradually. Dry ice sublimates directly into the gaseous phase.
• Wood combines with oxygen in the atmosphere, undergoing combustion.

1. The particles (atoms or molecules) in solids are packed very close together. There is little space between them, which gives solids their strong and rigid structure.
2. Solids have a fixed mass and maintain their shape regardless of the container or environment. This is because the particles are locked into place and do not move freely.
3. The distance between the particles in a solid is very small, which allows them to stay close together. They have a short intermolecular distance.
4. The forces holding the particles together in a solid are very strong, preventing them from easily separating. They have a strong intermolecular force.
5. Solids have a definite volume, meaning they take up a specific amount of space and do not change shape or size easily.
6. Solids are rigid and hard to bend. They do not flow or change shape like liquids or gases.
7. Negligible Compressibility: Since the particles in solids are packed closely together, they can’t be squeezed or compressed into a smaller space. This makes solids rigid and inflexible.