Narcissus calcicola pH and Crocus thomasii

Rodger Whitlock
Wed, 02 Apr 2003 22:41:36 PST
On 31 Mar 03 at 8:29, John Lonsdale wrote:

> From memory, the pH scale is a log scale so pH 6 is ten times more
> acid than pH7 !

At pH 6, the concentration of H+ ions is ten times greater than at
pH 7. However, biological responses to such environmental factors
are usually logarithmic rather than linear. That's the whole reason
for using a logarithmic scale such as pH rather than quoting the
actual acidity in millimoles of H+ per liter.

Soil acidity is not the only such situation: earthquakes and star 
brightnesses are also measured using logarithmic scales. As the San 
Andreas fault, so Narcissus calcicola.

Rodger Whitlock
Victoria, British Columbia, Canada
"To co-work is human,
to cow-ork, bovine."

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