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alum 音标拼音: ['æləm] [əl'ʌm]

n. 明矾

明矾

WordNet (r) 3.0 (2006) (WordNet)

alum
n 1: a white crystalline double sulfate of aluminum: the
ammonium double sulfate of aluminum [synonym: {alum}, {ammonia
alum}, {ammonium alum}]
2: a white crystalline double sulfate of aluminum: the potassium
double sulfate of aluminum [synonym: {alum}, {potassium alum},
{potash alum}]
3: a person who has received a degree from a school (high school
or college or university) [synonym: {alumnus}, {alumna}, {alum},
{graduate}, {grad}]
4: a double sulphate of aluminum and potassium that is used as
an astringent (among other things)

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

Alum \Al"um\, n. [OE. alum, alom, OF. alum, F. alun, fr. L.
alumen alum.] (Chem.)
A double sulphate formed of aluminium and some other element
(esp. an alkali metal) or of aluminium. It has twenty-four
molecules of water of crystallization.
[1913 Webster]

Note: Common alum is the double sulphate of aluminium and
potassium. It is white, transparent, very astringent,
and crystallizes easily in octahedrons. The term is
extended so as to include other double sulphates
similar to alum in formula.
[1913 Webster]

Alum \Al"um\, v. t.
To steep in, or otherwise impregnate with, a solution of
alum; to treat with alum. --Ure.
[1913 Webster]

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英文字典中文字典相关资料:

Alum - Wikipedia
By itself, alum often refers to potassium alum, with the formula KAl (SO 2O Other alums are named after the monovalent ion, such as sodium alum and ammonium alum
What is Alum | About Alum and Alum Substitution – McCormick
Alum, also known as potassium aluminum sulfate, is a naturally occurring mineral compound used across cultures and industries in various ways The most common type of alum found in kitchen pantries is potassium alum
What Is Alum and How Is It Used? - ThoughtCo
Alum is a type of chemical compound that is commonly used in everyday and industrial applications You'll find alum in everything from baking powder and toothpaste to cosmetics and some fire extinguishers, but there are also various types of alum with different use cases
13 Surprising Alum Powder Uses and Benefits - The Good Human
Alum is a granular powder or crystalline mass that is odorless, colorless, and transparent It has a flavor that is both sweet and astringent Its molecular weight is 458 28 grams per molecule Egypt, Italy, England, Germany, and India are the other countries that have alum mines
Alum | Definition, Uses, Formula, Facts | Britannica
Alums occur naturally in various minerals Potassium alum, for example, is found in the minerals kalinite, alunite, and leucite, which can be treated with sulfuric acid to obtain crystals of the alum Most alums have an astringent and acid taste They are colourless, odourless, and exist as a white crystalline powder
Alum: What It Is, Medicinal Benefits, Dosage, and Side Effects
Alum is a naturally occurring mineral salt with powerful astringent, antibacterial, and deodorizing effects It is used in oral hygiene, wound care, water purification, food preservation, and natural deodorants
ALUM Definition Meaning - Merriam-Webster
A little over a hundred years ago the shortened form of alum began to be used to describe a graduate or past attendee of either gender Although many people feel that alum is informal, it is in increasing use, and we appear to be moving toward a greater acceptance of the word
7 Benefits of Alum: Uses, Side Effects Precautions
Alum is a naturally occurring mineral known for its antiseptic, antibacterial, and astringent properties Found in crystal or powder form, it dissolves easily in water It is commonly used in water purification, skincare, oral hygiene, and even food preservation
What is alum in chemistry? - California Learning Resource Network
At its core, an alum is a double salt, typically formulated as XAl (SO 4) 2 ·12H 2 O, where X represents a monovalent cation such as potassium (K +), sodium (Na +), or ammonium (NH 4+) The presence of both aluminum (Al 3+) and sulfate (SO 42-) ions is a defining characteristic
Alum: Properties, Types, Amazing Applications - Science Info
Alum is an inorganic compound consisting of water molecules, aluminum, other metals besides aluminum, and sulfates Alum, in its hydrated state, is classified as a double salt There are various forms of alum, including Potash Alum, Soda Alum, Ammonium Alum, and Chrome Alum

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