ph
Học thuậtThân thiện
Definition
- Noun:
- A numerical scale, typically from 0 to 14, used to specify the acidity or basicity (alkalinity) of an aqueous solution. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic.
Usage
- pH is a scientific term used primarily in chemistry, biology, environmental science, medicine, and agriculture to describe the chemical nature of a solution.
- It is an abbreviation for "potential of Hydrogen" or "power of Hydrogen."
- It is often written with a lowercase 'p' and an uppercase 'H' (pH).
- It is typically followed by a number (e.g., pH 7, pH 4.5).
Examples
- Pure water has a neutral pH of 7.
- Lemon juice is acidic, with a pH of about 2.
- Soapy water is basic, often having a pH above 9.
- Scientists measured the pH of the lake to monitor its health.
- The ideal pH for most soil to grow vegetables is between 6 and 7.
Advanced Usage
- pH scale: The full range of the measurement system.
- The pH scale is logarithmic, meaning each whole number change represents a tenfold change in acidity.
- pH level: A common synonym for pH value.
- Maintaining the correct pH level in a swimming pool is important.
- pH value: The specific number on the pH scale.
- The pH value of the solution was recorded as 5.8.
Variants and Related Words
- pH meter (n): An electronic device used to measure the pH of a solution.
- pH indicator (n): A chemical compound that changes color depending on the pH of the solution it is in (e.g., litmus paper).
- pH paper (n): Paper strips impregnated with pH indicators for quick testing.
Synonyms
- Acidity/basicity measure
- Hydrogen ion concentration
Related Phrases / Collocations
- To test/measure the pH: To determine the pH value.
- You should test the pH of your aquarium water weekly.
- High/low pH: Referring to a basic or acidic solution, respectively.
- A low pH can corrode metal pipes.
- pH balance: A state where the acidity is at a desired or natural level.
- This shampoo helps maintain your scalp's pH balance.
Noun
- (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);