Diffusion is the process by which particles spread out to fill the available space. Both solids and liquids can diffuse into other liquids.
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Liquids flow and can change shape, making them fluid rather than rigid like solids.
Liquids have no fixed shape but possess a fixed volume, taking the shape of the container they occupy.
Solids have fixed shapes and volumes, unlike liquids and gases, and they exhibit negligible compressibility, making them distinct in their physical properties.
Solids are considered rigid because they are difficult to deform or change their shape, maintaining their structural integrity.