pH the symbol relating the hydrogen ion (H+) concentration or activity of a solution to that of a given standard solution. Numerically the pH is approximately equal to the negative logarithm of H+ concentration expressed in molarity. pH 7 is neutral; above it alkalinity increases and below it acidity increases.
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| PH abbr. public health |
pH (p   ch)n. A measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use ranges from 0 to 14. |
pH
A measurement of the acidity or alkalinity of a solution based on the amount of hydrogen ions available. Based on a scale of 14, a pH of 7.0 is neutral. A pH below 7.0 is an acid; the lower the number, the stronger the acid. A pH above 7.0 is a base; the higher the number, the stronger the base. Blood pH is slightly alkaline (basic) with a normal range of 7.36-7.44.
Mentioned in: Blood Gas Analysis, Carbon Monoxide Poisoning, Hypokalemia, Metabolic Acidosis, Metabolic Alkalosis, Respiratory Acidosis, Respiratory Alkalosis, Sitz Bath, Urinalysis, Urinary Anti-Infectives
pH,
abbreviation for potential hydrogen, a scale representing the relative acidity (or alkalinity) of a solution, in which a value of 7.0 is neutral, below 7.0 is acid, and above 7.0 is alkaline. The numeric pH value indicates the relative concentration of hydrogen ions in the solution compared with that of a standard (1 molar) solution. It is equal to the negative log of the hydrogen ion concentration expressed in moles per liter. See also acid, acid-base balance.
Ph,
symbol or abbreviation for phenyl, C6H5.
pH,
n measurement of the acidic or alkaline nature of a solution. Expressed as a numerical value, it is calculated by determining the log concentration of hydrogen ions present in the solution. A pH value of 7 indicates a neutral solution; a value less than 7 an acidic solution, and higher than 7 indicates an alkaline solution.
pH,
n the concentration of hydrogen ions expressed as the negative logarithm of base 10. A neutral solution (hydrogen ion activity equals hydroxide ion activity) has a pH of approximately 7. Aqueous solutions with pH values lower than 7 are considered acidic, whereas pH values higher than 7 are considered basic.
pH, critical,
n the point at which the minerals in a substance begin to decrease. For enamel, critical pH is between 4.5 and 5.5 moles/L; radical (root) critical pH is 6.0 to 6.7 moles/L.
pH
the negative logarithm of the hydrogen ion concentration [H+]; a measure of the degree to which a solution is acidic or alkaline. An acid is a substance that can give up a hydrogen ion (H+); a base is a substance that can accept H+. The more acidic a solution the greater the hydrogen ion concentration and the lower the pH; a pH of 7.0 indicates neutrality; a pH of less than 7 indicates acidity, and a pH of more than 7 indicates alkalinity.
pH-bicarbonate diagram
an aid to the assessment of an acid-base problem; expresses the relationship between bicarbonate ions and the pH of the plasma.
blood pH
normal blood pH varies a little between species but is of the order of 7.32 to 7.5. In moderate acidosis this falls to 7.25 to 7.30, severe acidosis 7.20 to 7.25 and grave acidosis to 7.00 to 7.10.
pH partition
the partition that occurs in the degree of ionization of electrolytes, including soluble drugs, about semipermeable membranes depending on the pH of the medium.
skin pH
in haired mammals, the pH of skin is usually acidic. In dogs it is from 5.5 to 7.2; in cats from 5.6 to 7.4; in cattle from 5.4 to 5.75; and in the horse from 4.8 to 6.8.
pHÂ
Symbol for the logarithm to base 10 of the reciprocal of the hydrogen (H) ion concentration measured in gram molecular weight in an aqueous solution. A solution with a pH 7.0 is neutral, one with a pH of more than 7.0 is alkaline, one with a pH lower than 7.0 is acid. It is a convenient way of expressing the acidity or alkalinity of solutions, particularly of contact lens buffer solutions. Alkaline ophthalmic solutions generally cause less discomfort than acidic ones. Note: pH stands for power (or potency) of H. See acidosis.
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