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curving paper

I have found that when I hang A4 sheets of paper by one thumbtack in the top center of the paper, the sides of the paper curve inwards after a few days. However, when I stuck A4 paper up beside a lightbulb, it didn't curve at all. I was wondering if this was caused by temperature. Is this correct, and if so, why?
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  • Asked by ln64z3
  • on 2010-10-27 10:12:17
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Categories: Weather .

Tags: temperature, paper.

 

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Fading thermal ink receipts

Why do thermal ink receipts fade out when you put them between statically charged surfaces?
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  • Asked by p_shim
  • on 2010-10-16 15:04:59
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Categories: Technology, Unanswered.

Tags: paper, static, ink, receipts.

 

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How many sheets of paper would it take to stop a bullet?
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  • Asked by Elthron
  • on 2010-10-11 18:13:47
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Categories: Technology.

Tags: Bullet, paper.

 

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Why does running an iron over a receipt or a bus ticket make it go dark purple or black?
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Categories: Domestic Science.

Tags: paper, iron.

 

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Weak when wet?

Why are some substances weak when wet - for example, paper?

What causes this?

 

 

EDIT: Jon, thanks for your great answer.

I assume when mentioning oil and water it is to do with the fact that oil is a non-polar solvent whereas water is polar (delta + and - right?)

Actually would you be kind enough to fully explain this to me?

Thanks!
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Last edited on: 2010-08-09 17:16:11

Categories: Our universe.

Tags: paper, wet, molecular, weak.

 

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Why does paper become more transparent when it is wet or oily?
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 (1 vote) average rating:4

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  • Asked by Sherring
  • on 2010-02-11 10:04:14
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Categories: Domestic Science.

Tags: water, paper, oil.

 

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6 matches found

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