(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);
双语例句
1. Skin is naturally slightly acidic and has a pH of 5.5.
皮肤具有天然弱酸性，pH值为5.5。
来自柯林斯例句
2. A pH test measures the acidity or alkalinity of a substance.
pH值测试可检测物质的酸碱度。
来自柯林斯例句
3. a pH of 7.5
pH值7.5
来自《权威词典》
4. The fluid that emerges from the vents is acidic (pH 3) and hot.
从那些出口出来的液体呈酸性（pH值为3），且是热的。
来自柯林斯例句
5. pH is a measure of the concentration of free hydrogen atoms in a solution.
pH值是测试溶液中自由氢原子浓度的单位。
来自柯林斯例句
用作名词 (n.)
Despite this diversity and the fact that certain organisms can grow at extremes of the pH scale, generalities can be made. 纵然有差异而事实上有些生物是可以在极端的酸碱度范围上生长，仍可以得到一些归纳结果。
High temperatures or extremes of pH make MAbs unravel.They typically expire in weeks unless stored near freezing temperatures. 高温和极端的酸碱度都会使抗体瓦解，如果没有冰冻保存，通常数星期就会坏掉。
