**Lived 1839 – 1903.**

Willard Gibbs was a mathematical physicist who made enormous contributions to science: he founded modern statistical mechanics, he founded chemical thermodynamics, and he invented vector analysis.

### Early Life and Education

Josiah Willard Gibbs was born on February 11, 1839 in New Haven, Connecticut, USA, the hometown of Yale University.

Willard Gibbs’ family was prosperous and intellectual. His mother’s name was Mary Anna Van Cleve. She came from an eminent family and was an amateur ornithologist. His father’s name was also Josiah Willard Gibbs. To avoid confusion, Gibbs Jr. was always known as Willard. His father, an expert on languages and linguistics, was a professor of sacred literature at Yale University’s School of Divinity.

Willard Gibbs was privately educated at Hopkins Grammar School until he enrolled at Yale University, aged just 15. He was awarded his degree four years later, in 1858, along with university prizes in mathematics and Latin.

He immediately began working for an engineering Ph.D. at Yale, which he was awarded in 1863, at the age of 24. This was the first ever award of an engineering Ph.D. to any student at an American university.

His highly mathematical thesis had the title: “On the Forms of the Teeth of Wheels in Spur Gearing.”

Socially, Gibbs was quiet and bookish, a somewhat reserved student. Academically, he was brilliant.

While Gibbs was a student, three significant events took place:

- In 1855, his mother died.
- In 1861, his father died, leaving Gibbs and his two sisters a substantial inheritance, making them financially independent.
- From 1861–65 the American Civil War raged. Gibbs was not conscripted: his health was fragile, and he suffered from respiratory problems. Also, his eyesight for reading was blurred, caused by astigmatism. He eventually had to grind lenses himself to solve this problem.

## Gibbs’ Academic Career

**Tutoring at Yale**

Yale University appointed Gibbs as a tutor in 1863. Tutors were expected to make themselves available to teach any of Yale’s courses. Gibbs taught Latin for two years, followed by a year teaching physics, while he continued privately to widen and sharpen his knowledge of engineering and the physical sciences. During this time he patented an improved railway car brake.

**Three Years in France and Germany**

In 1866 Gibbs and his sisters, Anna and Julia, set off on a three-year trip to Europe.

Like his father, he seems to have had a considerable gift for languages, so working in French and German caused him no problems.

France, Germany and the United Kingdom lay at the heart of the scientific world. Gibbs took a unique approach by spending three years studying in the non-English speaking countries, which gave him a distinctive scientific viewpoint compared with other American scientists of the time.

During the trip to Europe, Gibbs’ health was again a concern – tuberculosis was suspected – and he and his sisters moved to the French Riviera, hoping the warm, dry Mediterranean climate would help him. Thankfully, after a few months on the Riviera, he was pronounced free of tuberculosis.

**Professorship at Yale**

On his return to New Haven, Gibbs taught French for a time at Yale, and worked privately on some of his engineering ideas.

In 1871 he was appointed Yale’s first professor of mathematical physics. The role was unpaid. Gibbs was happy with this situation – he was a man of modest needs, and his inheritance provided him with more than enough money. Furthermore, Gibbs was happy that the role required little teaching work, allowing him more thinking and research time.

As his scientific reputation grew, other universities head-hunted him. Gibbs chose to stay at Yale, because he was happy in the familiar surroundings of his hometown and, also, Yale’s other scientists told him how much they valued his presence at the university. He stayed at Yale for the whole of his career and the University started paying him a salary to counterbalance offers he received from other institutions.

## Gibbs’ Most Significant Contributions to Science

Gibbs was a man of immense intellect; his work’s reception brings to mind Isaac Newton’s experience when he first published his laws of motion and gravitation. One of his students is said to have joked about Newton:

“There goes a man who has written a book that neither he nor anybody else understands.”

It was left to others to explain and spread Newton’s complex ideas and mathematics.

Similarly, when Gibbs published his research, it was often little understood. One of the few people who did understand and appreciate its significance was James Clerk Maxwell.

Indeed when Maxwell died at a young age, the word in Yale – with echoes of the old joke about Newton – was:

“Only one man lived who could understand Gibbs’ papers. That was Maxwell, and now he is dead.”

## Thermodynamics

Thermodynamics explores the relationship between temperature, entropy, and energy. Its laws underpin the physical characteristics of everything in the universe, including life. Its ideas are rather complex; easier aspects of thermodynamics are not usually introduced until university level in chemistry and physics or perhaps the end of high school chemistry.

In 1873, two years into his professorship, the 34-year-old Gibbs began publishing work that revolutionized our understanding of thermodynamics. He began by noting that the first two laws of thermodynamics could be combined into a single equation of state – the *Gibbs Equation of State* – now a basic equation of thermodynamics:

*d*U = T

*d*S – P

*d*V

In two groundbreaking papers he showed how expressing thermodynamic quantities on graphs he had constructed led to entirely new conclusions about the behavior of matter. These graphs were in three dimensions, with x, y and z axes.

Gibbs sent copies of his work to 75 notable scientists in Europe. One of these was James Clerk Maxwell at the University of Cambridge.

### Willard Gibbs and James Clerk Maxwell

Maxwell, one of the world’s foremost authorities on thermodynamics, devoured Gibbs work, realizing that it solved a conceptual problem he had been wrestling with in vain for over two years. Furthermore, Gibbs’ new interpretation of thermodynamics improved Maxwell’s personal understanding of the field.

Maxwell shared Gibbs’ work enthusiastically with other British scientists.He made three 3-dimensional plaster models of a surface in one of Gibbs’ graphs and sent one model to Gibbs as a token of his appreciation and respect.

Maxwell and Gibbs were on the same mental wavelength – they understood each other’s work, which few other people did at the time.

Unfortunately, Maxwell’s untimely death in 1879 deprived the scientific world of what could have become a very fruitful, if long-distance, partnership between two great intellects.

### Reshaping the Science of Thermodynamics

In 1878 Gibbs published a third thermodynamics paper, the most revolutionary of them all. *On the Equilibrium of Heterogeneous Substances Part II*.

In this paper Gibbs founded the science of chemical thermodynamics, entirely shaping our modern understanding of the field. This work lies at the heart of physical chemistry, telling us which chemical reactions are feasible.

Unfortunately, Gibbs’ work was so highly mathematical that it took many years before its message was fully understood.

If Gibbs had a fault, it was that he used mathematics to do nearly all of his talking for him. He felt little need to relate his mathematics and ideas to real-world examples and he was not concerned if people said his work was too hard to understand.

He took exactly the same lofty approach to his lectures as he did his writing. One of his best students, Edwin Bidwell Wilson, recalled being told by Gibbs:

*Equilibrium*is something like reading Laplace, who frequently omits but the conclusion, with the optimistic remark ‘it is easy to see’, shorthand for things ‘seen’ following hours — sometimes days — of hard work.”

### The Phase Rule

Gibbs discovered that in any equilibrium mixture of C components in P phases the number of variables F that can be independently controlled is:

With this rule, which is a general, fundamental rule of thermodynamics, phase diagrams become an indispensable part of the toolkit of physical chemistry.

### Gibbs’ Thermodynamics on a Stamp

In 2005, a U.S. stamp commemorated Gibbs’ graphical thermodynamics methods bearing an image of Gibbs and a two-dimensional contour map of one of his thermodynamic surfaces.

## Vector Analysis – A New Branch of Mathematics

James Clerk Maxwell used a form of mathematics called quaternion calculus in his electromagnetic theory of light. Gibbs took up Maxwell’s new theory enthusiastically, but he thought the quaternion calculus Maxwell had used seemed rather inconvenient. It had a vector part and a scalar part, but in Gibbs’ opinion was geometrically unsatisfying.

In order to teach Maxwell’s theory to his own students, Gibbs developed a new branch of mathematics called vector analysis/calculus. He did this in 1881 – 1884, producing lecture notes for his new mathematical methods.

British physicist Oliver Heaviside independently invented vector calculus between 1880 and 1887. Neither man was aware of the other’s work.

The vector calculus invented by Gibbs and Heaviside is now used extensively in both physics and mathematics.

The notation used today for the scalar and vector products was also devised by Gibbs.

## Statistical Mechanics

Statistical mechanics allows physical phenomena to be explained and calculated by averaging the individual behaviors of huge numbers of atoms/molecules.

In 1902, Gibbs published a new scientific masterpiece – *Elementary Principles in Statistical Mechanics*. He had worked day and night on the book in late 1900 and early 1901.

What we now know as statistical mechanics had been invented and developed by Daniel Bernoulli, James Clerk Maxwell and Ludwig Boltzmann.

Gibbs’ book came like a bolt from the blue. It needed to refer only a little to what had gone before; and then revealed an entirely new formulation of the science.

Gibbs devised a new mathematical framework for statistical mechanics which bridged the gap between classical and (as yet undiscovered) quantum physics, paving the way for the quantum world that was to unfold in the following years.

Like his earlier works, most scientists found Gibbs’ statistical mechanics book difficult to understand. However, perseverance eventually bore fruit and it is Gibbs’ formulation of statistical mechanics that is still used today – he even coined the term *statistical mechanics*.

### Honors

In 1880 Gibbs won the Rumford Prize of the American Academy of Arts and Sciences.

In 1901 he was awarded the British Royal Society’s Copely Medal, which was then the greatest prize in science, equal to a Nobel Prize today; and a rarer award, since only one Copely Medal was awarded each year. The award citation stated that Gibbs was:

“the first to apply the second law of thermodynamics to the exhaustive discussion of the relation between chemical, electrical, and thermal energy and capacity for external work.”

### Some Personal Details and the End

Except for three years in Europe, Gibbs lived all his life in the large family home his father built in New Haven, Connecticut.

This steady life suited him, because he was a man who enjoyed regularity and order. There is an irony in this, given that Gibbs significantly advanced our understanding of entropy – which is often characterized as *disorder*.

He attended church regularly and left New Haven only during his summer vacations, which he liked to spend in the mountains.

Gibbs was perceived by people who knew him as kind, sympathetic and happy. He never married. He shared the family home with his sisters: Anna, who remained unmarried; and Julia, her husband and children.

Josiah Willard Gibbs died at the age of 64 on April 28, 1903, just a year after he published his seminal work on statistical thermodynamics. His death was caused by an intestinal obstruction.

He was buried in the Grove Street Cemetery, New Haven.

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**Further Reading**

Josiah Willard Gibbs

H A Bumstead

American Journal of Science, September 1903.

Proceedings of the Gibbs Symposium: Yale University, May 15-17, 1989

D. G. Caldi, George D. Mostow

American Mathematical Soc., Science, 7 Nov, 1990.

Willard Gibbs: American Genius

Muriel Rukeyser

Reprinted by the Ox Bow Press, Woodbridge CT, 1942.

Reminiscence of Gibbs by a Student and Colleague

Edwin Bidwell Wilson

Bulletin of the American Mathematical Society, Vol 37, No. 6 (June 1931) p401 – 416.

Acht vorlesungen über theoretische physik: gehalten an der Columbia university in the city of New York im frühjahr 1909

Max Planck