explain thermal expantion
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Thermal expansion is the tendency of matter to change in shape, volume, and area in response to a change in temperature. ... The degree of expansion divided by the change in temperature is called the material's coefficient of thermal expansion. It is found to generally vary with temperature.
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The hypopharynx extends from the hyoid bonesuperiorly to the cricoid cartilage inferiorly. It is the most inferior of the anatomic subdivisions of the pharynx, beginning at the inferior border of the oropharynx and eventually connecting with the cervical esophagus at the cricopharyngeal muscle
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