酸性（さんせい、sansei）
- acidity

The Japanese word 酸性 (さんせい) means "acidity" or "acidic." It refers to a chemical property of a substance, indicating that it has a higher concentration of hydrogen ions (H+) in solution. This means that a 酸性 substance has the ability to donate protons or accept electrons. This is often described as having a pH value less than 7.

⚫︎この液体は酸性です。 Translation: This liquid is acidic. ⚫︎レモンは酸性の食べ物です。 Translation: Lemons are acidic foods. ⚫︎酸性雨は環境に悪影響を与えます。 Translation: Acid rain has a negative impact on the environment.

You use 酸性 when you want to describe something as being acidic. This word is commonly used in scientific contexts, but can also be used in everyday conversation to describe the taste or nature of certain substances, such as food. For example, you might describe the taste of a lemon as 酸性.

The word 酸性 is written as follows: • Kanji: 酸性 • Hiragana: さんせい There are no variations in the okurigana. The word is always written as "性".

There are no direct synonyms in Japanese that specifically mean "acidic" or "acidity" without using the word 酸性 or related terms. However, related words or phrases that describe acidic properties or concepts include: • 酸っぱい (suppai) - sour (referring to taste) • pHが低い (pH ga hikui) - low pH

The antonym of 酸性 is アルカリ性 (arukari-sei), which means "alkaline" or "basic." This refers to substances with a pH greater than 7.

この洗剤は酸性ではなく、アルカリ性です。 ・Translation: This detergent is not acidic; it is alkaline. ・Explanation: This sentence uses 酸性 to describe that a detergent is not acidic, contrasting it with its antonym, alkaline.

胃酸過多は、胃液が酸性になりすぎることです。 ・Translation: Hyperacidity is when stomach acid becomes too acidic. ・Explanation: This sentence explains a medical condition involving excessive stomach acidity, using the word 酸性 to describe the property of the stomach acid.

The word 酸性 is a compound word. "酸" (san) means "acid," and "性" (sei) means "property," "nature," or "characteristic." Thus, the word literally means "acid property" or "acidic nature." The kanji for "acid", 酸, is derived from the idea of "sour" or "tart" and is associated with substances that have a tangy taste.