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UNIT III- INTRODUCTION - - There are several important topics that we will cover in this unit: Viscosity and the particle theory of matter The density of fluids The buoyant force that liquids exert on objects that float on them How these things are important Viscosity & The Particle Theory Do you remember the particle theory of matter? How do different phases of matter look like at the molecular level? The particle theory states that all matter is made of tiny particles. The particles are always moving around and vibrating. Particles are spaced differently in solids, liquids, and gases. When heat is added to particles, the particles will move faster. As a result the state of matter may change. Different substances are made of different particles. Solids In solids, particles are held tightly together with strong forces. Particles do not move, but they can vibrate. Liquids Particles are in contact with each other, but only have weak forces between them. The particles are able to slide past each other. Gases Particles are far apart from each other. There are few, if any, forces between them. Particles are able to move freely.