# Karl Herzfeld

> Karl Ferdinand Herzfeld was an Austrian–American physicist and chemist. He worked on condensed matter physics, fluid dynamics, and statistical mechanics. In 1927, he was the first to quantify when a substance is a metal or an insulator. The Goldhammer–Herzfeld criterion to classify metalloids is named after him. With Frank O. Rice, he studied the rate equations of the pyrolysis of acetaldehyde in 1934. Their model is known as the Rice–Herzfeld mechanism.

*Austrian-American physicist (1892–1978)*

**Canonical URL:** https://fame.am/person/karl-herzfeld

## Identity
- **Profile type:** Scientist ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Scientists
- **Country:** United States
- **Born:** 1892-02-24
- **Died:** 1978-06-03
- **Status:** deceased
- **Gender:** male

## Bio

Imported from discovery source: wikidata-dump

## Fame
- **Popularity score:** 44.9 / 100
- **Momentum:** 0.6 / 100  (trend: FALLING)
- **Historical depth:** 10.3 / 100
- **Now attention:** 0.0 / 100
- **Source confidence:** 60.0 / 100
- **Profile completeness:** 70.0 / 100

## Sources
- [Karl Herzfeld](https://pt.wikipedia.org/wiki/Karl_Herzfeld)
- [كارل هيرزفيلد](https://ar.wikipedia.org/wiki/%D9%83%D8%A7%D8%B1%D9%84_%D9%87%D9%8A%D8%B1%D8%B2%D9%81%D9%8A%D9%84%D8%AF)
- [كارل هيرزفيلد](https://arz.wikipedia.org/wiki/%D9%83%D8%A7%D8%B1%D9%84_%D9%87%D9%8A%D8%B1%D8%B2%D9%81%D9%8A%D9%84%D8%AF)
- [کارل هرتسفلد](https://azb.wikipedia.org/wiki/%DA%A9%D8%A7%D8%B1%D9%84_%D9%87%D8%B1%D8%AA%D8%B3%D9%81%D9%84%D8%AF)
- [Karl Herzfeld](https://da.wikipedia.org/wiki/Karl_Herzfeld)
- [Karl Ferdinand Herzfeld](https://de.wikipedia.org/wiki/Karl_Ferdinand_Herzfeld)
- [Karl Herzfeld](https://en.wikipedia.org/wiki/Karl_Herzfeld)
- [Karl Herzfeld](https://es.wikipedia.org/wiki/Karl_Herzfeld)
- [کارل هرتسفلد](https://fa.wikipedia.org/wiki/%DA%A9%D8%A7%D8%B1%D9%84_%D9%87%D8%B1%D8%AA%D8%B3%D9%81%D9%84%D8%AF)
- [Karl Herzfeld](https://fr.wikipedia.org/wiki/Karl_Herzfeld)
- [Karl Herzfeld](https://hu.wikipedia.org/wiki/Karl_Herzfeld)
- [Karl Herzfeld](https://pl.wikipedia.org/wiki/Karl_Herzfeld)
- [Wikidata](https://www.wikidata.org/wiki/Q84763)

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