負の熱膨張

Density anomaly - unusual physicochemical process in which some materials contract upon heating. Article “負の熱膨張” in Japanese Wikipedia has 18.4 points for quality (as of July 1, 2025). The article contains 19 references and 6 sections.

This article has the best quality in German Wikipedia. Also, this article is the most popular in that (Japanese) language version.

Since the creation of article “負の熱膨張”, its content was written by 7 registered users of Japanese Wikipedia and edited by 335 registered Wikipedia users in all languages.

The article is cited 9 times in Japanese Wikipedia and cited 150 times in all languages.

The highest Authors Interest rank from 2001:

• Local (Japanese): #12729 in July 2018
• Global: #22251 in February 2024

The highest popularity rank from 2008:

• Local (Japanese): #267654 in July 2023
• Global: #104350 in February 2021

There are 11 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	German (de) Dichteanomalie		33.3301
2	Spanish (es) Dilatación térmica negativa		30.2299
3	English (en) Negative thermal expansion		28.8404
4	Croatian (hr) Anomalija vode		20.5136
5	Slovak (sk) Anomália vody		19.479
6	Japanese (ja) 負の熱膨張		18.3733
7	French (fr) Anomalie dilatométrique		17.8984
8	Arabic (ar) تمدد حراري سلبي		8.2944
9	Persian (fa) انبساط گرمایی معکوس		2.8714
10	Greek (el) Θερμική συστολή		1.2013

More...

The following table shows the most popular language versions of the article.

The most popular language versions of the article "負の熱膨張" in all the time

#	Language	Popularity award	Relative popularity
1	German (de) Dichteanomalie		1 208 669
2	English (en) Negative thermal expansion		311 526
3	Croatian (hr) Anomalija vode		272 282
4	Slovak (sk) Anomália vody		97 858
5	Spanish (es) Dilatación térmica negativa		72 867
6	French (fr) Anomalie dilatométrique		69 958
7	Arabic (ar) تمدد حراري سلبي		56 262
8	Japanese (ja) 負の熱膨張		28 169
9	Greek (el) Θερμική συστολή		7 425
10	Esperanto (eo) Densanomalio		4 897

More...

The following table shows the language versions of the article with the highest popularity in the last month.

The most popular language versions of the article "負の熱膨張" in June 2025

#	Language	Popularity award	Relative popularity
1	German (de) Dichteanomalie		1 515
2	English (en) Negative thermal expansion		1 402
3	Croatian (hr) Anomalija vode		479
4	Slovak (sk) Anomália vody		299
5	Japanese (ja) 負の熱膨張		294
6	French (fr) Anomalie dilatométrique		117
7	Arabic (ar) تمدد حراري سلبي		81
8	Spanish (es) Dilatación térmica negativa		67
9	Greek (el) Θερμική συστολή		11
10	Persian (fa) انبساط گرمایی معکوس		7

More...

The following table shows the language versions of the article with the highest Authors’ Interest.

Language versions of the article "負の熱膨張" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	German (de) Dichteanomalie		166
2	English (en) Negative thermal expansion		61
3	Croatian (hr) Anomalija vode		30
4	French (fr) Anomalie dilatométrique		19
5	Slovak (sk) Anomália vody		19
6	Arabic (ar) تمدد حراري سلبي		13
7	Esperanto (eo) Densanomalio		8
8	Spanish (es) Dilatación térmica negativa		7
9	Japanese (ja) 負の熱膨張		7
10	Greek (el) Θερμική συστολή		3

More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

Language versions of the article "負の熱膨張" with the highest AI in June 2025

#	Language	AI award	Relative AI
1	German (de) Dichteanomalie		3
2	English (en) Negative thermal expansion		1
3	Arabic (ar) تمدد حراري سلبي		0
4	Greek (el) Θερμική συστολή		0
5	Esperanto (eo) Densanomalio		0
6	Spanish (es) Dilatación térmica negativa		0
7	Persian (fa) انبساط گرمایی معکوس		0
8	French (fr) Anomalie dilatométrique		0
9	Croatian (hr) Anomalija vode		0
10	Japanese (ja) 負の熱膨張		0

More...

The following table shows the language versions of the article with the highest number of citations.

Language versions of the article "負の熱膨張" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	German (de) Dichteanomalie		71
2	English (en) Negative thermal expansion		23
3	French (fr) Anomalie dilatométrique		11
4	Arabic (ar) تمدد حراري سلبي		9
5	Japanese (ja) 負の熱膨張		9
6	Croatian (hr) Anomalija vode		8
7	Greek (el) Θερμική συστολή		7
8	Esperanto (eo) Densanomalio		6
9	Persian (fa) انبساط گرمایی معکوس		3
10	Spanish (es) Dilatación térmica negativa		2

More...

#	Language	Value
ar	Arabic تمدد حراري سلبي
de	German Dichteanomalie
el	Greek Θερμική συστολή
en	English Negative thermal expansion
eo	Esperanto Densanomalio
es	Spanish Dilatación térmica negativa
fa	Persian انبساط گرمایی معکوس
fr	French Anomalie dilatométrique
hr	Croatian Anomalija vode
ja	Japanese 負の熱膨張
sk	Slovak Anomália vody

Best Rank

Japanese: #267654 07.2023

Global: #104350 02.2021

Best Rank

Japanese: #12729 07.2018

Global: #22251 02.2024

On 9 December 2025 in multilingual Wikipedia, Internet users most often read articles on the following topics: Stranger Things, 2026 FIFA World Cup, Lando Norris, Millie Bobby Brown, Sean Combs, It: Welcome to Derry, ChatGPT, Zootopia 2, deaths in 2025, Cassie Ventura.

In Japanese Wikipedia the most popular articles on that day were: 堂上隼人, 濱田太貴, 辰見鴻之介, 中村獅童 (2代目), 松浦慶斗, 井上広大, 知野直人, 平沼翔太, 佐藤直樹 (野球), 濱将乃介.

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information