States of matter — AQA GCSE Combined Science Synergy
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- The model of particles in motion can be used to account for states of matter, differences in density, the pressure of gases, and changes of state. This model is applied in Transport into and out of cells (page 30) to explain how substances are transported into and out of cells through diffusion and osmosis, and in Systems in the human body (page 36), where it is applied to substances crossing exchange surfaces. The nature of the particles (atoms, molecules and ions) is examined in more detail in Atomic structure (page 24) and Structure and bonding (page 98).