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litmus 音標拼音: [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 - 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 TEST | definition in the Cambridge English Dictionary
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What Is a Litmus Test? How It Works and What It Means
A litmus test is a simple chemical test that tells you whether a liquid is acidic or basic (alkaline) You dip a small strip of specially treated paper into the liquid, and the paper changes color: red means acid, blue means base
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

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