Definitions for ph
This dictionary definitions page includes all the possible meanings, example usage and translations of the word ph.
pH, pH scalenoun
(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);
The negative of the logarithm to the base 10 of the concentration of hydrogen ions, measured in moles per liter; a measure of acidity or alkalinity of a substance, which takes numerical values from 0 (maximum acidity) through 7 (neutral) to 14 (maximum alkalinity).
Etymology: From p, denoting negative logarithm, and H, denoting hydrogen.
In chemistry, pH (, denoting 'potential of hydrogen' or 'power of hydrogen') is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions (solutions with higher concentrations of H+ ions) are measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution. This is because the formula used to calculate pH approximates the negative of the base 10 logarithm of the molar concentration of hydrogen ions in the solution. More precisely, pH is the negative of the base 10 logarithm of the activity of the H+ ion.At 25 °C, solutions with a pH less than 7 are acidic, and solutions with a pH greater than 7 are basic. Solutions with a pH of 7 at this temperature are neutral (e.g. pure water). The neutral value of the pH depends on the temperature, being lower than 7 if the temperature increases. The pH value can be less than 0 for very strong acids, or greater than 14 for very strong bases.The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. Primary pH standard values are determined using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. The pH of aqueous solutions can be measured with a glass electrode and a pH meter, or a color-changing indicator. Measurements of pH are important in chemistry, agronomy, medicine, water treatment, and many other applications.
pH is a scale used to specify the acidity or basicity of an aqueous solution. It is a measure of the concentration of hydrogen ions in a solution and ranges from 0 to 14. A pH of 7 is considered neutral, below 7 is acidic, and above 7 is alkaline or basic. This term was first defined by Danish chemist Søren Peter Lauritz Sørensen in 1909.
In chemistry, pH is a measure of the activity of the hydrogen ion. p[H], which measures the hydrogen ion concentration, is closely related to, and is often written as, pH. Pure water has a pH very close to 7 at 25 °C. Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline. The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. Primary pH standard values are determined using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. Measurement of pH for aqueous solutions can be done with a glass electrode and a pH meter, or using indicators. pH measurements are important in medicine, biology, chemistry, agriculture, forestry, food science, environmental science, oceanography, civil engineering, chemical engineering, nutrition, water treatment & water purification, and many other applications.
pH scale ((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)
Submitted by rinat on July 11, 2021
British National Corpus
Rank popularity for the word 'ph' in Nouns Frequency: #2243
The numerical value of ph in Chaldean Numerology is: 4
The numerical value of ph in Pythagorean Numerology is: 6
What I saw coming out of my Ph.D in 98 and 99 was this wave of technologies that would enable us to take way better snapshots.
Soap has a high pH that can disrupt the outer layer of your skin and cause inflammation and dryness.
Why isn't there a nutrition resource teacher in our schools? there are plenty of Ph.D's and master's in nutrition who would love that job. Start with the young people.
Drink a good amount of water before [going out] — at least 6 to 8 glasses, with a little lemon or orange, which are acidic and balance your pH.
A lot of fellows nowadays have a B.A., M.D., or Ph.D. Unfortunately, they don't have a J.O.B.
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