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More ways to get Braingle...

Best for a Cold Night

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#13075
Fun:*** (2.73)
Difficulty:* (0.99)
Category:Science
Submitted By:ejasami***
Corrected By:rashad

 

 

 



Which keeps you warmer, a two-inch thick blanket or two blankets one inch thick each? The blankets are made of the exact same material.




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Comments

tissueAus*
Jun 16, 2003

Good show! Keep it up!
griphookph*
Jun 16, 2003

very interesting. May I request more information on this? thanks.
Bobbrt**
Jun 20, 2003

In general, whenever you have a substance that is not moving, you have a heat insulator. Since there is "dead air" between the blankets, it provides more mass for the heat to have to transfer through, and therefore more insulation. Three layers of material, even if one of the layers is air, is always better than two.
curtiss82**
Dec 24, 2003

I would like to add to this since I have a degree in chemical engineering. When ever two objects are placed together, there is resistance to heat flow since there is a gap between the two surfaces, no matter how smooth the surfaces. The gap is usually filled with air, which is a poor conductor of heat. A way to reduce the contact resistance is to apply pressure or apply a liquid substance the is good conductor of heat.
bigSWAFF_69_Aus*
Nov 25, 2005

I got it pretty easily, good one!


Except I've never seen a blanket two inches thick
bookworm91**
Nov 28, 2005

i got it. that was a good one.
VudluxiA*
Jun 03, 2006

Easy but good. Who would have thought they taught this in chemical engineering?
vbguy101*us*
Aug 22, 2006

Knew that!

The same principle applies to insulation in a Thermos.
dudebomb93Aus*
Oct 29, 2007

I GET ALOT OF THESE SCIENCE ONE RIGHT,IM MUST BE SMART
yangjunAsg*
Feb 18, 2008

i love science!!!and this question is very easy!!!
yangjunAsg*
Feb 18, 2008

i love science!!!and this question is very easy!!!



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