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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
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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
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Litmus | Acid-Base Reactions, pH Testing Indicators | Britannica
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
LITMUS | definition in the Cambridge English Dictionary
The litmus paper quickly determines which is which; useful, since they will look identical to each other and to water
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 - 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
Litmus - definition of litmus by The Free Dictionary
A colored powder, obtained from certain lichens, that changes to red in an acid solution and to blue in an alkaline solution ♦ Litmus is typically added to paper to make litmus paper, which is used to determine whether a solution is basic or acidic
LITMUS Definition Meaning | Dictionary. com
Litmus is the mix of dyes that's used to make litmus paper, a scientific tool that makes it easy to see if a material has an acidic pH Made from lichen, litmus can be absorbed onto paper which turns blue to indicate an alkaline substance and red if it's acidic

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