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A solid object is in the phase of matter characterized by resistance to deformation and changes of volume. At the microscopic scale, a solid has these properties: The branch of physics that deals with solids is called solid-state physics, and is a type of condensed matter physics. Materials science is primarily concerned with properties of solids such as strength and phase transformations. It overlaps strongly with solid state physics. Solid-state chemistry overlaps both of these fields, but is especially concerned with the synthesis of novel materials. The lightest known solid is man-made and is called aerogel. The lightest aerogel produced has a density of 1.9 mg per cm3 or 1.9 kg/m3 (526.3 times lighter than water). We encounter many solids in our every day lives. Some examples of solids are ice, wood, glass, plastic, and more.
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