| 单词 | pH |
| 释义 | pH [pē`āch] CHEMISTRY A term used to describe the hydrogen-ion activity of a system; it is equal to -log aH+; here aH+ is the activity of the hydrogen ion; in dilute solution, activity is essentially equal to concentration and pH is defined as -log10[H+], where H+ is hydrogen-ion concentration in moles per liter; a solution of pH 0 to 7 is acid, pH of 7 is neutral, pH over 7 to 14 is alkaline. |
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