hydrogen exponent

hy·dro·gen ex·po·nent

(hī'drō-jen eks-pō'nent),
The decadic logarithm of the hydrogen ion concentration in blood or other fluid; its negative value is the pH of that fluid.

hy·dro·gen ex·po·nent

(hī'drō-jen eks-pō'nĕnt)
The logarithm of the hydrogen ion concentration in blood or other fluid; its negative is the pH of that fluid.