# Julius von Mayer

> He pinned down the law that energy never vanishes or appears from nothing — then watched another man get the credit.

*German physicist (1814-1878)*

**Canonical URL:** https://fame.am/person/julius-von-mayer

## Identity
- **Profile type:** Scientist ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Scientists
- **Country:** Germany
- **Born:** 1814-11-25
- **Died:** 1878-03-20
- **Status:** deceased
- **Gender:** male

## Bio

Julius Robert von Mayer was a German physician who crossed into physics and chemistry, and in 1841 he wrote one of the first clear statements of what became the first law of thermodynamics: energy can be neither created nor destroyed. A year later he described oxidation as the engine of life and suggested that plants turn light into chemical energy. But his work went unnoticed. In 1843, James Joule published his own calculation of the mechanical equivalent of heat, and history handed him the priority Mayer had earned first. Mayer lived another three decades, the founder whose founding went unrecorded until long after the fact.

## Fame
- **Popularity score:** 55.9 / 100
- **Momentum:** 6.0 / 100  (trend: RISING)
- **Historical depth:** 23.2 / 100
- **Now attention:** 24.1 / 100
- **Source confidence:** 60.0 / 100
- **Profile completeness:** 70.0 / 100

## Topics
#Scientists, #Scientist, #Physics, #Medicine, #Chemistry, #19th Century

## Sources
- [Wikipedia](https://en.wikipedia.org/wiki/Julius_von_Mayer)
- [Wikidata](https://www.wikidata.org/wiki/Q57171)
- [Pantheon 2.0](https://pantheon.world/profile/person/Julius%20von%20Mayer)
- [یولیوس روبرت فون مایر](https://azb.wikipedia.org/wiki/%DB%8C%D9%88%D9%84%DB%8C%D9%88%D8%B3_%D8%B1%D9%88%D8%A8%D8%B1%D8%AA_%D9%81%D9%88%D9%86_%D9%85%D8%A7%DB%8C%D8%B1)
- [Юліус Роберт Маер](https://be.wikipedia.org/wiki/%D0%AE%D0%BB%D1%96%D1%83%D1%81_%D0%A0%D0%BE%D0%B1%D0%B5%D1%80%D1%82_%D0%9C%D0%B0%D0%B5%D1%80)
- [Юлиус Роберт фон Майер](https://bg.wikipedia.org/wiki/%D0%AE%D0%BB%D0%B8%D1%83%D1%81_%D0%A0%D0%BE%D0%B1%D0%B5%D1%80%D1%82_%D1%84%D0%BE%D0%BD_%D0%9C%D0%B0%D0%B9%D0%B5%D1%80)
- [Julius Robert von Mayer](https://ca.wikipedia.org/wiki/Julius_Robert_von_Mayer)
- [Julius Robert von Mayer](https://cs.wikipedia.org/wiki/Julius_Robert_von_Mayer)
- [Julius von Mayer](https://cy.wikipedia.org/wiki/Julius_von_Mayer)
- [Robert von Mayer](https://da.wikipedia.org/wiki/Robert_von_Mayer)
- [Robert Mayer](https://de.wikipedia.org/wiki/Robert_Mayer)
- [Γιούλιους φον Μάγιερ](https://el.wikipedia.org/wiki/%CE%93%CE%B9%CE%BF%CF%8D%CE%BB%CE%B9%CE%BF%CF%85%CF%82_%CF%86%CE%BF%CE%BD_%CE%9C%CE%AC%CE%B3%CE%B9%CE%B5%CF%81)
- [Julius von Mayer](https://eo.wikipedia.org/wiki/Julius_von_Mayer)
- [Julius von Mayer](https://es.wikipedia.org/wiki/Julius_von_Mayer)
- [Julius Robert von Mayer](https://eu.wikipedia.org/wiki/Julius_Robert_von_Mayer)
- [یولیوس روبرت فون مایر](https://fa.wikipedia.org/wiki/%DB%8C%D9%88%D9%84%DB%8C%D9%88%D8%B3_%D8%B1%D9%88%D8%A8%D8%B1%D8%AA_%D9%81%D9%88%D9%86_%D9%85%D8%A7%DB%8C%D8%B1)
- [Julius Robert von Mayer](https://fi.wikipedia.org/wiki/Julius_Robert_von_Mayer)
- [Julius Robert von Mayer](https://fr.wikipedia.org/wiki/Julius_Robert_von_Mayer)
- [יוליוס רוברט פון מאייר](https://he.wikipedia.org/wiki/%D7%99%D7%95%D7%9C%D7%99%D7%95%D7%A1_%D7%A8%D7%95%D7%91%D7%A8%D7%98_%D7%A4%D7%95%D7%9F_%D7%9E%D7%90%D7%99%D7%99%D7%A8)
- [Robert Mayer](https://hr.wikipedia.org/wiki/Robert_Mayer)
- [Julius Robert von Mayer](https://hu.wikipedia.org/wiki/Julius_Robert_von_Mayer)
- [Յուլիուս Ռոբերտ Մայեր](https://hy.wikipedia.org/wiki/%D5%85%D5%B8%D6%82%D5%AC%D5%AB%D5%B8%D6%82%D5%BD_%D5%8C%D5%B8%D5%A2%D5%A5%D6%80%D5%BF_%D5%84%D5%A1%D5%B5%D5%A5%D6%80)
- [Julius von Mayer](https://id.wikipedia.org/wiki/Julius_von_Mayer)
- [Julius Robert von Mayer](https://it.wikipedia.org/wiki/Julius_Robert_von_Mayer)
- [ユリウス・ロベルト・フォン・マイヤー](https://ja.wikipedia.org/wiki/%E3%83%A6%E3%83%AA%E3%82%A6%E3%82%B9%E3%83%BB%E3%83%AD%E3%83%99%E3%83%AB%E3%83%88%E3%83%BB%E3%83%95%E3%82%A9%E3%83%B3%E3%83%BB%E3%83%9E%E3%82%A4%E3%83%A4%E3%83%BC)
- [Wikiquote](https://en.wikiquote.org/wiki/Julius_Robert_von_Mayer)
- [Wikiquote](https://it.wikiquote.org/wiki/Julius_Robert_von_Mayer)
- [يوليوس ماير](https://ar.wikipedia.org/wiki/%D9%8A%D9%88%D9%84%D9%8A%D9%88%D8%B3_%D9%85%D8%A7%D9%8A%D8%B1)
- [يوليوس ماير (دكتور من مملكة ڤورتيمبيرج)](https://arz.wikipedia.org/wiki/%D9%8A%D9%88%D9%84%D9%8A%D9%88%D8%B3_%D9%85%D8%A7%D9%8A%D8%B1_(%D8%AF%D9%83%D8%AA%D9%88%D8%B1_%D9%85%D9%86_%D9%85%D9%85%D9%84%D9%83%D8%A9_%DA%A4%D9%88%D8%B1%D8%AA%D9%8A%D9%85%D8%A8%D9%8A%D8%B1%D8%AC))

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