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A comment on New material shows zero heat expansion from 4 to 1400 K. Parent comment

Re:New material shows zero heat expansion from 4 to 1400 K by elcritch on Saturday June 12, 2021 @06:36PM (#27487980)
Bond vibration is one. In crystalline materials those vibrations can produce phonons, or waves, of thermal energy.

See: https://www.chemicool.com/definition/phonons.html

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