Litmus
['lɪtməs]
解釋/意思:
(noun.) a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator.
錄入:普勒斯顿--From WordNet
解釋/意思:
(n.) A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.
贝妮塔整理
解釋/意思:
n. a dye obtained from certain lichens originally red but becoming blue on the addition of alkalies or of lime.—Litmus paper paper used in chemical testing tinged blue by litmus reddened by an acid made blue again by an alkali.
坎蒂丝手打
例句/造句/用法:
- In his right hand he held a slip of litmus-paper. 亞瑟·柯南·道爾. 福爾摩斯回憶錄.
- Bases always turn red litmus paper blue. 伯莎M.克拉克. 科學通論.
- Hence, in order to detect the presence of acid in a substance, one has merely to put some of the substance on blue litmus paper, and note whether or not the latter changes color. 伯莎M.克拉克. 科學通論.
- But the best test of an acid is by sight rather than by taste, because it has been found that an acid is able to discolor a plant substance called litmus. 伯莎M.克拉克. 科學通論.
- If now red litmus paper is tested in the same solution, its color also will remain unchanged; such a result indicates infallibly the absence of any basic quality. 伯莎M.克拉克. 科學通論.
手打:莉莲