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Does a white shirt weight more

  1. May 26, 2012 #1
    Does a white shirt weight more than a dark shirt of the same material when exposed to sunlight?

    I think that photos exert a pressure on the material, and since white shirts reflect some light it would experience twice the change in momentum compared to a completely dark shirt. Then the shirt would weight more?
     
  2. jcsd
  3. May 26, 2012 #2

    phinds

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    well, on the other hand, dark shirts absorb more, so have more energy, thus more effective mass, so should weight more.

    I have no idea, really :smile:
     
  4. May 27, 2012 #3
    A dark shirt will have additional [heat] energy and so will 'weigh' more. Such a change is analogous to a coiled spring having more energy and hence a greater gavitational attraction than an uncoiled spring.
     
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