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Melvil Decimal System: 540.5

Wording: Mathematics and Science > Chemistry > Chemistry > Periodicals

Dewmoji: 🔬 > > > ?

0
Information
196,272
ℹ️
1
Philosophy and Psychology
182,817
💭
2
Religion
463,618
🙏🏽
3
Social Sciences
1,017,722
👫
4
Language
130,463
💬
5
Mathematics and Science
322,970
🔬
6
Technology
751,859
💡
7
Arts and Recreation
695,837
🎨
8
Literature
929,791
📚
9
Biography and History
592,368
🗿
50
General Science
24,934
🔬
51
Mathematics
61,944
52
Astronomy
17,388
🌌
53
Physics
34,172
🍎
54
Chemistry
22,053
55
Earth sciences & geology
28,173
🌎
56
Fossils & prehistoric life
6,394
💀
57
Life Sciences
45,977
🐠
58
Botany
17,698
🌿
59
Zoology
64,237
🐼
540
Chemistry
4,849
541
Physical; Theoretical
5,133
💭
542
Chemical laboratories
328
🔬
543
Analytic
2,125
🌈
544
Qualitative Analysis [No longer used]
188
545
Quantitative Analysis [No longer used]
145
546
Inorganic
2,006
547
Organic
5,498
548
Crystallography
723
💎
549
Mineralogy
1,058
540.0
Chemistry
56
540.1
Theory And Instruction
334
540.2
Miscellany
110
540.3
Dictionaries And Encyclopedias
89
📕
540.4
Essays, lectures, etc.
5
📄
540.5
Periodicals
18
540.6
Societies
16
540.7
Education And Research
581
540.8
Culture Studies
144
540.9
Biography And History
485
540.50
1
540.51540.52540.53
2
540.54
2
540.55540.56540.57540.58540.59

Wording

1922 Edition
Modern language
Emoji

"Far Friends"

MDS classes with significant recommendations overlap, excluding ones under the same top-level class.

None

What is MDS?

Melvil stands for "Melvil Decimal System," named after Melvil Dewey, the famous librarian. Melvil Dewey invented his Dewey Decimal System in 1876, and early versions of his system are in the public domain.

More recent editions of his system are in copyright, and the name "Dewey," "Dewey Decimal," "Dewey Decimal Classification" and "DDC" are registered trademarked by OCLC, who publish periodic revisions.

LibraryThing's MDS system is based on the classification work of libraries around the world, whose assignments are not copyrightable. MDS "scheduldes" (the words that describe the numbers) are user-added, and based on public domain editions of the system.

The Melvil Decimal System is NOT the Dewey Decimal System of today. Wordings, which are entered by members, can only come from public domain sources. The base system is the Free Decimal System, a public domain classification created by John Mark Ockerbloom. Where useful or necessary, wording comes from the 1922 edition of the Dewey Decimal System. Language and concepts may be changed to fit modern tastes, or to better describe books cataloged. Wordings may not come from in-copyright sources.

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