- A sour substance.
- A chemical compound that typically contains oxygen and has a pH less than 7, being able to donate a proton (H+) to a base, and able to form a covalent bond with an electron pair, known as Bronsted-Lowry acid-base theory.
Middle english, from latin acidus, from acēre to be sour; akin to old english ǣsce sour.
- Lemon juice is an example of an acid.
- Acids are commonly used in laboratory experiments.
- The acid in your stomach helps to break down food.
- Acid rain is caused by the release of sulfur dioxide and nitrogen oxide into the atmosphere.
- Acid can be used to etch metal.