Master Topic P1 of OCR Gateway Combined Science A (J250): the particle model and the development of the atomic model, density, states of matter and changes of state, conservation of mass, internal energy and specific heat capacity, specific latent heat, and particle motion and gas pressure. Worked calculations, required-practical methods, exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (Pressure in fluids and atmospheric pressure are separate-science only and are not covered.)
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