Heinrich Friedrich Weber
Heinrich Friedrich Weber (1843–1912) was a distinguished German physicist whose empirical research provided critical insights into the thermal properties of elements. While perhaps less known today than his contemporaries, Weber's work on specific heats—the amount of heat per unit mass required to raise the temperature by one degree Celsius—laid the groundwork for future breakthroughs in quantum physics.
Key Facts
- Born: November 7, 1843, in Magdala, Saxe-Weimar-Eisenach.
- Died: May 24, 1912, in Zurich, Switzerland.
- Education: University of Jena; doctorate received in 1865.
- Major Contribution: Discovered that specific heats of carbon, boron, and silicon are lower at low temperatures than predicted by the Dulong–Petit law.
- Academic Affiliation: ETH Zurich (formerly Zurich Polytechnic).
- Notable Mentors: Ernst Abbe and Hermann von Helmholtz.
Academic Foundations and Mentorship
Weber began his academic journey at the University of Jena around 1861. During this time, he came under the influence of Ernst Abbe, a physicist who shaped Weber's approach to science. Although Weber initially struggled with mathematics and abandoned it, Abbe encouraged his dynamism and focus on optical theory. Abbe instilled in Weber a lifelong commitment to precision instrumentation and the belief that scientific research should remain closely tied to practical application.
Weber earned his doctorate in 1865 with a thesis titled Neue Probleme der Diffraktionstheorie des Lichtes, focusing on the theory of light diffraction. After a period as a private tutor in Pforzheim, Weber expanded his professional network, connecting with Gustav Kirchhoff and Gustav Heinrich Wiedemann.
The most significant turning point in his career occurred in 1871 when he became the first assistant to Hermann von Helmholtz at the University of Berlin. For three years, Weber was instrumental in establishing and managing the Berlin laboratory, further refining his skills as an experimental physicist.
The Challenge to the Dulong–Petit Law
Between 1872 and 1874, Weber published two landmark papers in Annalen der Physik. His research focused on the specific heats of carbon, boron, and silicon across various temperatures. At the time, the Dulong–Petit law predicted that the molar specific heat of solid elements should be a constant value.
Weber's empirical measurements revealed a striking anomaly: at low temperatures, the specific heats of these three elements were significantly lower than the law predicted. He observed that as temperatures increased, the specific heats rose rapidly, only aligning with the Dulong–Petit predictions once temperatures exceeded 1,000 degrees Celsius. These findings remained an unexplained anomaly for nearly thirty years until later theoretical advancements provided a solution.
| Category | Details |
|---|---|
| Primary Field | Physics |
| Key Research Elements | Carbon, Boron, Silicon |
| Doctoral Advisor | Ernst Abbe |
| Key Institution | ETH Zurich |
| Notable Student | Albert Einstein |
Relationship with Albert Einstein
In his later career at the Zurich Polytechnic (now ETH Zurich), Weber served as the doctoral advisor for both Albert Einstein and Mileva Marić. However, the relationship was fraught with tension. Einstein famously criticized Weber's lectures as being 50 years out of date, noting that they lacked the essential Maxwell's equations.
The friction culminated in a bitter disagreement, leading Einstein to switch his advisor to Alfred Kleiner. Weber gave Einstein and Marić the lowest essay grades in their class, awarding them 4.5 and 4.0 respectively on a scale of 1 to 6.
Frequently Asked Questions
What was Weber's most significant scientific discovery?
Weber discovered that the specific heats of carbon, boron, and silicon are much lower at low temperatures than the Dulong–Petit law predicted, and that they increase rapidly as temperature rises.
Who were the primary influences on Weber's career?
His career was decisively shaped by two physicists: Ernst Abbe, who influenced his early research and view of practical science, and Hermann von Helmholtz, who served as his primary mentor in Berlin.
How did Weber and Albert Einstein get along?
They had a strained relationship. Einstein found Weber's teaching outdated and the two had a bitter disagreement that led Einstein to change advisors.
What was the subject of Weber's doctoral thesis?
Weber's 1865 dissertation focused on the theory of light diffraction, titled Neue Probleme der Diffraktionstheorie des Lichtes.
Where did Weber spend the latter part of his career?
Weber spent his later academic years at the Zurich Polytechnic, which was renamed the Eidgenössische Technische Hochschule (ETH Zurich) in 1911.