noun
buffer solution
Technical term in chemistry for a solution that resists changes in pH when small amounts of acid or base are added.
実験では、pHを一定に保つために緩衝液を使います。
In the experiment, we use a buffer solution to keep the pH constant.
Compound of 緩衝 (buffer, cushioning) and 液 (liquid, solution). The exact historical derivation is uncertain; the term is a modern scientific coinage.