This is a demonstration of thermal expansion using a metal sphere and ring. The sphere does not easily fit through the ring when they are both at the same temperature, but fits easily through the ring when the ring is heated.

This demonstration was created at Utah State University by Professor Boyd F. Edwards, assisted by James Coburn (demonstration specialist), David Evans (videography), and Rebecca Whitney (closed captions), with support from Jan Sojka, Physics Department Head, and Robert Wagner, Executive Vice Provost and Dean of Academic and Instructional Services.

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