acidity

Everyday

1. Acidity is how acidic something is: how strong an acid it is. tree →
2. Acidity is the sour taste of acidic food like lemons. tree →
3. (informal) Acidity can mean heartburn or too much acid in the stomach. tree →
4. Acidity of words or a manner means sharpness or unkindness (literary). tree →

In the lessons

Used in science (the pH scale: below 7 is acidic; testing with litmus or red cabbage indicator), in gardening (soil acidity), environment (acid rain, ocean acidity), cooking and health.

Examples

• We tested the acidity of lemon juice with indicator paper. tree →
• Vinegar has a high acidity. tree →
• The pH scale measures acidity. tree →
• Some plants need soil with high acidity. tree →
• The acidity of the oceans is rising as they absorb carbon dioxide. tree →
• The acidity of the orange made my mouth tingle. tree →
• Too much fizzy drink can cause acidity in the stomach. tree →

Note

Uncountable. Adjective: «acidic» or «acid». On the pH scale, a LOWER number means HIGHER acidity: pH 2 is more acidic than pH 5. Opposite: «alkalinity».