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ph 音标拼音: [p'i'etʃ]

n. ph值

ph值

WordNet (r) 3.0 (2006) (WordNet)

pH
n 1: (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); [synonym: {pH}, {pH scale}]

The Free On-line Dictionary of Computing (foldoc)

The {country code} for the Philippines.

(1999-01-27)

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pH - Wikipedia
In chemistry, pH ( piːˈheɪtʃ or piːˈeɪtʃ ; pee-AYCH) is a logarithmic scale used to specify the acidity or basicity of aqueous solutions Acidic solutions (solutions with higher concentrations of hydrogen (H+) cations) are measured to have lower pH values than basic or alkaline solutions
PH | Definition, Scale, Uses, Examples, Facts | Britannica
A pH value is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion into numbers between 0 and 14
What Is pH? - Definition, Uses, Facts - Science Notes and Projects
pH measures the concentration of hydrogen ions (H⁺) in a solution and indicates whether a solution is acidic, neutral, or basic The pH scale typically ranges from 0 to 14, where 7 is neutral, values below 7 are acidic, and values above 7 are basic (alkaline)
pH Scale: Acids, Bases, and Common Materials
The pH scale is a measurement system that ranges from 0 to 14 and indicates the acidity or alkalinity (basicity) of a solution
What is pH? - US EPA
What is pH? Acidic and alkaine (or "basic") are two extremes that describe substances, usually liquids or chemicals, just like hot and cold are two extremes that describe temperature A substance that is neither acidic nor alkaline is neutral The pH scale measures how acidic or alkaline a substance is The scale ranges from 0 to 14
pH Scale: Definition, Chart, Values, Range - Chemistry Learner
pH is a scale used to measure the acidity or basicity of a solution It ranges from 0 to 14 and reflects the relative concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻) in aqueous solutions
pH and Water | U. S. Geological Survey - USGS. gov
pH is a measure of how acidic basic water is The range goes from 0 to 14, with 7 being neutral pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base
pH | US EPA
pH is an expression of hydrogen ion concentration in water Specifically, pH is the negative logarithm of hydrogen ion (H +) concentration (mol L) in an aqueous solution: pH = -log 10 (H +) The term is used to indicate basicity or acidity of a solution on a scale of 0 to 14, with pH 7 being neutral
What Is pH? A Free Explanation of the pH Scale - Biology Insights
pH is a number that tells you how acidic or alkaline (basic) a solution is The scale runs from 0 to 14 in everyday use, with 7 as the neutral midpoint Numbers below 7 indicate an acid, numbers above 7 indicate a base, and each step on the scale represents a tenfold change in acidity or alkalinity
pH - Simple English Wikipedia, the free encyclopedia
Most substances have a pH in the range of 0 to 14, although extremely acidic or alkaline substances may have pH < 0, or pH > 14 Alkaline substances have, instead of hydrogen ions, a concentration of hydroxide ions (OH -)

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