Rubber band in air vs water?

  • Thread starter IB tired
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  • #1
IB tired
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Hmm...some experimenting led to an interesting result. I attached a weight to a rubber band and suspended the rubber band in some hot water. The rubber band expanded. I repeated the experiment in cold water and the band shrank. An expected result, yes? Well I redid the experiment in air and I got something totally different. I used a hairdryer and heated the band with the weight on it and the band shrunk...anybody care to explain why?
thanks!
:)
 

Answers and Replies

  • #2
Lok
555
23
Do you have an estimate (be close) of the temperatures involved?
 
  • #3
berkeman
Mentor
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13,807
Hmm...some experimenting led to an interesting result. I attached a weight to a rubber band and suspended the rubber band in some hot water. The rubber band expanded. I repeated the experiment in cold water and the band shrank. An expected result, yes? Well I redid the experiment in air and I got something totally different. I used a hairdryer and heated the band with the weight on it and the band shrunk...anybody care to explain why?
thanks!
:)

Maybe google to see how "heat shrink tubing" works. Note -- the rubber band's length was permanently changed by the hot air, correct?
 

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