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Density, pressure and changes of state

Particle model and thermal physics · Lesson 1 of 4

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Lesson 1 of 4 · Particle model and thermal physics

Density, pressure and changes of state

3 quick checks≈2% of the testFoundational

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By the end you’ll be able to

calculate density using $\rho = \dfrac{m}{V}$ and rearrange the equation to determine mass or volume from appropriate data and units
describe and compare the arrangement, spacing and motion of particles in solids, liquids and gases
explain melting, freezing, boiling, evaporation and condensation in terms of particle energy and attraction between particles

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apply the liquid-pressure relationship $p = h\rho g$ and relate pressure in a liquid to depth, density and gravitational field strength

interpret observations of state change and pressure effects using the particle model, including differences between evaporation and boiling

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