alkali

英 ['?lk?la?] 美['?lk?'lai]

TEM8IELTSGRE擴展詞匯

復(fù)數(shù):?alkalis;

alkali 堿

來自阿拉伯語al-qaliy. al, 定冠詞。qaliy, 灰，堿灰。

alkali: alkali: [14] English acquired alkali via Latin from Arabic al-qalīy ‘the ashes’, a derivative of the verb qalay ‘fry’. The implicit reference is to the plant saltwort (Latin name Salsola kali), which was burnt to obtain its alkaline ashes (Chaucer’s canon’s yeoman, the alchemist’s assistant, mentions it: ‘Salt tartre, alcaly, and salt preparat, And combust matieres, and coagulat’, 1386). The modern chemical sense of a compound which combines with an acid to form a salt was first used in 1813, by the chemist Sir Humphry Davy.
alkali (n.): late 14c., "soda ash," from Medieval Latin alkali, from Arabic al-qaliy "the ashes, burnt ashes" (of saltwort, a plant growing in alkaline soils), from qala "to roast in a pan." The modern chemistry sense is from 1813.

1. AAR can be assorted two classifications: Alkali - Silica Reaction ( ASR ) and Alkali - Carbonate Reaction ( ACR ).: AAR主要分兩類: 堿 - 硅酸反應(yīng)(Alkali-Silica Reaction, 簡稱 ASR ) 和堿 - 碳酸鹽反應(yīng) ( Alkali-CarbonateReaction,簡稱ACR ).

2. Alkali - aggregate reaction ( AAR ) is one of significant factors affecting durability of concrete structures.: 堿 - 集料反應(yīng) ( Alkali-Aggregate Reaction,AAR ) 是影響混凝土耐久性的重要因素.

3. The valence atom of an alkali - metal atom has two states.: 堿金屬原子的價原子具有兩種能態(tài).

4. Such detergents do not yellow the wool as alkali tends to do.: 這種洗滌劑不會象堿那樣使羊毛發(fā)黃.

5. All the alkali metals have a single s - electron outside a closed shell.: 所有的堿金屬都在閉合殼層之外有一單個S電子.