Keywords

States of Matter

Particles

• Everything made up of particles
• Robert Brown discovered movements of pollen in water
• 'Brownian Motion' - the random motion of particles
• e.g dust particles dancing in the air
• e.g cooking, smell diffuses
• Diffusion - The mixing process of particles by colliding and moving in different directions

— Higher concentration to lower concentration

• Heavier masses = Slower diffusion

<aside> 💡 Distance between particles of solid = Distance between particles of liquid < Distance between particles of gas

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States of Matters and Their Properties

<aside> 💡 Gases do not have a definite volume because they can be compressed.

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— When gas is compressed, particles bounce off walls of container more often —> higher air pressure

—Reduced temperature = less air pressure [heat = energy to bounce of walls]