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# ph

«ph» in Mova's school dictionary: **a number that shows how acidic or alkaline a liquid is…** — its meaning for a pupil, its sense in the lessons and examples, with 3 sentences of Mova's corpora that use it.

### part of speech

noun (pH); letters (ph)

### meaning for a pupil

1) pH is a number that shows how acidic or alkaline a liquid is, on a scale from 0 to 14. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#m1)

2) The letters «ph» together usually make an /f/ sound, as in phone and elephant. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#m2)

### sense in the lessons

In science, pH 7 is neutral (pure water), below 7 is acid (lemon juice), above 7 is alkali (soap). Litmus paper or universal indicator changes colour to show pH. In phonics, «ph» is one way to spell the /f/ sound, mostly in words from Greek.

### examples

- Lemon juice has a low pH because it is acidic. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#x1)
- Pure water has a pH of 7. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#x2)
- The indicator turned purple, so the pH was high. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#x3)
- «Ph» in «photo» sounds like f. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#x4)
- We tested the pH of the pond water. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#x5)
- Soap has a pH above 7. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/#x6)

### note

Write it pH (small p, capital H). A LOWER pH number means MORE acidic. Each step is ten times stronger: pH 3 is ten times more acidic than pH 4.

### In the corpora

- [Universal indicator mixes several dyes, so each pH gets its own colour, a whole rainbow from red to purple.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/17-indicators-the-red-cabbage-rainbow/6/)
- [The colour substance in red cabbage changes shape at different pH, and each shape has a different colour.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/17-indicators-the-red-cabbage-rainbow/10/)
- [Scientists also use electronic pH meters.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/17-indicators-the-red-cabbage-rainbow/17/)

### Trees and pragmatics

[Every meaning and example of «ph» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/ph/), each sentence with its dependency tree and frames.