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litmus 音标拼音: [l'ɪtməs]

n. 石蕊

石蕊

WordNet (r) 3.0 (2006) (WordNet)

litmus
n 1: 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 [synonym: {litmus}, {litmus
test}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Litmus \Lit"mus\, n. [D. lakmoes; lak lacker moes a thick
preparation of fruit, pap, prob. akin to E. meat: cf. G.
lackmus. See {Lac} a resinous substance.] (Chem.)
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.
[1913 Webster]

Note: Litmus is used as a dye, and being turned red by acids
and restored to its blue color by alkalies, is a common
indicator or test for acidity and alkalinity.
[1913 Webster]

{Litmus paper} (Chem.), unsized paper saturated with blue or
red litmus, -- used in testing for acids or alkalies.
[1913 Webster]

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LITMUS Definition Meaning - Merriam-Webster
The meaning of LITMUS is a coloring matter from lichens that turns red in acid solutions and blue in alkaline solutions and is used as an acid-base indicator
Litmus - All-in-One Email Marketing Platform | Tools to Drive Success
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Litmus - Wikipedia
Litmus is a water-soluble mixture of different dyes extracted from lichens It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue In short, it is a dye and indicator which is used to place substances on a pH
LITMUS | English meaning - Cambridge Dictionary
LITMUS definition: 1 a powder that is turned red by acid and blue by alkali: 2 a powder that is turned red by acid… Learn more
Litmus | Acid-Base Reactions, pH Testing Indicators | Britannica
litmus, mixture of coloured organic compounds obtained from several species of lichens that grow in the Netherlands, particularly Lecanora tartarea and Roccella tinctorum Litmus turns red in acidic solutions and blue in alkaline solutions and is the oldest and most commonly used indicator of whether a substance is an acid or a base Treatment of the lichens with ammonia, potash, and lime in
litmus - Wiktionary, the free dictionary
litmus (countable and uncountable, plural litmuses) (uncountable) A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels A simple test of acidity in a liquid using litmus, usually in the form of litmus paper A simple test of any attribute; a litmus test
Litmus - definition of litmus by The Free Dictionary
Define litmus litmus synonyms, litmus pronunciation, litmus translation, English dictionary definition of litmus n A water-soluble bluish powder derived from certain lichens that changes to red with increasing acidity and to deeper blue with increasing basicity
LITMUS - Definition Translations | Collins English Dictionary
Discover everything about the word "LITMUS" in English: meanings, translations, synonyms, pronunciations, examples, and grammar insights - all in one comprehensive guide
litmus noun - Definition, pictures, pronunciation and usage notes . . .
Definition of litmus noun in Oxford Advanced Learner's Dictionary Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more
LITMUS Definition Meaning | Dictionary. com
LITMUS definition: a blue coloring matter obtained from certain lichens, especially Roccella tinctoria In alkaline solution litmus turns blue, in acid solution, red: widely used as a chemical indicator See examples of litmus used in a sentence

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