For a physics project I'm changing the temperature of a rubber band and measuring elasticity. The rubber band will be tied to a mass and will be heated in a water bath.
Some sources show data of the rubber band becoming softer and stretchier (there is data of this), whereas others list that the entropic force results in the rubber band contracting. There are demonstrations of this on Youtube, but no data.
Here are a few examples of the sources that say the band will become stretchier when heated:
http://tuhsphysics.ttsd.k12.or.us/Research/IB08/FrazPoinFurm/index.htm#Graph https://www.1000sciencefairprojects.com/Physics/elasticity-vs-temperature.php http://tuhsphysics.ttsd.k12.or.us/Research/IB10/RajeJaneHerm/index.htm#Background:
Why is there a contradiction? If I were to try this myself with a heat bath, which would be the most likely outcome? I am going to use the same type of rubber band as used in the sources above.