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Natural Logs in the Real World

Asked by Lee Hughes, New Lima H.S. in Oklahoma on Sunday Feb 11, 1996:
I need information on natural logs as it applies to the natural world. This includes such things as plant or population growth or decay such as a bouncing spring. Any information found on the internet or any other resources would be appreciated.
There's a general discussion about some ways in which the number e (on which natural logarithms are based) has relevance in the real world; that discussion is right here on this web site, at

Any natural phenomenon that grows or decays at a rate proportional to its current value (such as population growth) can be used in place of the compound interest example given in that discussion.

If you want to know some more specific things after reading that, please post another question here and we'd be happy to give additional information.

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