PARTICLE ARRANGEMENT IN MATTER
• In solids, the particles are tightly packed in a rigid pattern and so cannot move away from each other.
Figure 2: Particle arrangement in solid state
• This is why solids generally have a fixed shape.
For example: pen, pencil, wood, bottle, steel, etc.
• A solid has fixed size and shape.
• In liquids, the particles are not as tightly packed as in solids; so they can move and slide over each other.
Figure 3: Particle arrangement in liquid state
• This makes liquids flow and take the shape of the container they are poured in.
For example: milk, oil, water, etc.
• Liquids have size or volume.
• Liquids do not have a definite shape.
• They take the shape of the container.
• In gases, the particles are far apart from each other and can move freely.
Figure 4: Particle arrangement in gaseous state
• So, gases can flow easily and take up all the available space.
For example: oxygen, nitrogen, hydrogen, helium, carbon, etc.
• Gases cannot be seen.
• A gas is a matter that has no shape or size of its own.