silica
シリカ
解説 Definition
silica は「シリカ」を意味する名詞で、二酸化ケイ素を主成分とする物質を指します。砂、石英、ガラスなどに含まれ、工業材料や乾燥剤などにも関係します。
Silica is silicon dioxide, a hard mineral substance found widely in sand, quartz, and many rocks. It is used in glassmaking and industrial materials, while porous forms such as silica gel are commonly used to absorb moisture.
覚え方のコツ Memory Tip
silica は二酸化ケイ素を指し、化学式 SiO₂ と結び付けると覚えやすい語です。砂や石英の主要成分で、silica gel は乾燥剤に使われます。silicon は元素のケイ素、silica はその酸化物、silicate はケイ酸塩なので区別が重要です。fine silica dust は吸入を避けるべき粉じん、という典型的な組み合わせも押さえましょう。
Connect silica with the formula SiO₂: it is silicon dioxide, not the element silicon itself. Picture three familiar settings—sand and quartz in nature, glass in manufacturing, and small silica gel packets used to control moisture. The phrase fine silica dust is also important because inhaling respirable particles can damage the lungs. Keep three related terms separate: silicon is the chemical element Si, silica is its dioxide, and a silicate is a salt or mineral containing silicon and oxygen in a broader chemical structure. This element–oxide–mineral distinction provides a reliable scientific framework for remembering the word.
例文
Silica is a common component of sand and quartz.
シリカは砂や石英に多く含まれる成分である。
The packet contains silica to keep the product dry.
その小袋には製品を乾燥した状態に保つためのシリカが入っている。
Workers should avoid breathing fine silica dust.
作業員は細かいシリカ粉じんを吸い込まないようにすべきだ。
silica の類義語・関連語
silica の語源・成り立ち Etymology
silicaは近代ラテン語の化学語で、ラテン語silex（属格silicis）『火打石・硬い石』から作られました。silic-が語幹で、『石のように硬い鉱物成分』という感覚がそのまま石英や砂の主成分名につながります。関連語はsilicon、silicate。
Silica is a modern Latin scientific term formed from Latin silex, whose genitive form is silicis, meaning “flint” or “hard stone.” The stem silic- was used in naming substances associated with flint and similar minerals. The English chemical term refers specifically to silicon dioxide, the principal substance in quartz and a major component of many sands. Silicon and silicate were formed from the same Latin stem, but they name the element and a broader class of compounds, respectively.
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