Particle model

• Particle theory states that all matter is made up of tiny particles that are constantly in motion due to their kinetic energy.
• Different states of matter can exist as a solid, liquid, or gas.
• In a solid, the particles remain in a fixed position and they vibrate.
• Solids have a fixed shape, meaning that whatever container you put it in, it will still stay the same shape.
• Solids also have a fixed volume, they can't be compressed, which means squashed.
• In a liquid, the particles aren't fixed and they roll over and around each other.
• Liquids also don't have a fixed shape, they take on the shape of their container while their volume remains unchanged, meaning the liquid will always take up the same amount of space regardless of the shape of the container.
• Liquids can slightly be compressed, but it is so minimal that we generally say that liquids can't be compressed.
• Gas particles move around freely with high amounts of kinetic energy.
• Gases don't have a fixed shape and they will expand or compress to fill whatever container they are put in.
• The movement of gas particles is represented in a diagram by adding little tails to each of the particles to show that they're moving in different directions and with high speed.