Andrew Simmons 28 July 2007
Surface Area : Volume Ratios and Dehydration
 
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Conclusions

This investigation showed that:

  • The human body can be modelled by approximating body parts to basic geometric shapes
  • Surface area is proportional to the square of the scale factor
  • Volume is proportional to the cube of the scale factor
  • Surface area to volume ratio increases when an object is scaled down

Why can Infants Dehydrate in Hot Weather, but Adults don't?

Due to infants' small size, they have a higher surface area to volume ratio than adults do. Because the body loses water through the skin when you sweat and infants have more surface area for their volume than adults, infants dehydrate in hot weather much faster than an adults do.

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This is a secondary school project (use with caution). See resources for references and image credits.