Physics - P3 Notes

The Particle Model of Motion in Gases

• The three states of matter are solids, liquids, and gases
• Solids - strong forces of attraction, held together in regular patterns, not much energy (only vibrate)
• Liquids - weaker forces, close together and can move, some energy
• Gas - no forces of attraction, more energy so they are free to move, random directions and speeds
• In a sealed container, the outward gas pressure is equal to the total force exerted by all the particles

Density of Materials

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