The pH (potential of hydrogen) scale was introduced (1909) by S. P. Sorensen (1868–1939).
A neutral pH near 7 is optimal for many biological processes, although some, such as the light reactions of photosynthesis, depend on pH gradients. In nature, pH can be high, such as in soda lakes or drying ponds, or as low as 0 and below. Organisms that live at either extreme do this by maintaining the near-neutral pH of their cytoplasm, i.e., the liquid and materials within their cells. See also acidophiles and alkaliphile.
Related category PHYSICAL CHEMISTRY
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