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Entropy is a difficult concept to teach using real-world examples. Unliketemperature, pressure, volume, or work, it's not a quantity which most studentsencounter in their day-to-day lives. Even the way entropy is oftenqualitatively described, as a measure of disorder, is incomplete and can bemisleading. In an effort to address these obstacles, we have developed a simplelaboratory activity, the stretching of an elastic rubber sheet, intended togive students hands-on experience with the concepts of entropy, temperature andwork in both adiabatic and quasistatic processes. We present two versions ofthe apparatus: a double-lever system, which may be reproduced with relativelylittle cost, and a commercial materials testing system, which provides studentsexperience with scientific instrumentation that is used in research.

Stretching Rubber, Stretching Minds: a polymer physics lab for teaching entropy