(from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic);
PH的用法和樣例：
例句
用作名詞 (n.)
Despite this diversity and the fact that certain organisms can grow at extremes of the pH scale, generalities can be made. 縱然有差異而事實上有些生物是可以在極端的酸鹼度範圍上生長，仍可以得到一些歸納結果。
High temperatures or extremes of pH make MAbs unravel.They typically expire in weeks unless stored near freezing temperatures. 高溫和極端的酸鹼度都會使抗體瓦解，如果沒有冰凍保存，通常數星期就會壞掉。
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