Physical world and mathematics

Han Young Woo

Han Young Woo is a South Korean polymer chemist, a full professor of chemistry at Korea University in Seoul, known for semi-crystalline polymer donors for organic solar cells.

Han‐Yue Zhang

Han-Yue Zhang (张含悦) is a Chinese materials chemist at Southeast University in Nanjing who designs biodegradable molecular ferroelectrics for biomedical uses, co-leading a 2024 Science paper.

Hand (unit)

The hand, also known as the hand-breadth, is a unit of length standardized at 4 inches and used to measure the height of horses from the ground to the withers.

Hand-searching

Hand-searching is a supplementary search method in evidence synthesis in which a person manually examines journals page by page to find trial reports that databases miss.

Handbuch der Physik

Handbuch der Physik, or Handbook of Physics, is a German-language encyclopedia of physics published by Springer in Berlin, in a first edition of 24 volumes and a second of 55.

Handong Sun is a physicist working in optoelectronics and semiconductor optics, known for lasing from colloidal perovskite nanocrystals and semiconductor microlasers, and elected a Fellow of the American Physical Society in 2016.

Hanging mercury drop electrode

The hanging mercury drop electrode (HMDE) is a working electrode for electroanalysis on which the whole experiment is performed on one drop of mercury hanging from a capillary.

Hanif D. Sherali

Hanif D. Sherali was an American operations researcher and industrial engineer at Virginia Tech who originated the Reformulation-Linearization Technique and joined the National Academy of Engineering.

Hankel matrix

A Hankel matrix is a square or rectangular matrix whose entries are constant along each anti-diagonal, named after the German mathematician Hermann Hankel.

Hankel transform

The Hankel transform, also called the Bessel transform, is an integral transform with a Bessel-function kernel, used on radially symmetric problems in cylindrical coordinates.

Hanksite

Hanksite is a rare anhydrous sulfate-carbonate-chloride mineral, named in 1885 for California's first state mineralogist and best known from large crystals at Searles Lake, its type locality.

Hanle effect

The Hanle effect is the magnetic-field depolarization and rotation of the plane of linear polarization of resonance-scattered spectral line radiation, discovered by Wilhelm Hanle in 1924.

Hanna M. Mahmoud

Hanna M. Mahmoud is a physicist credited in the 2015 Nobel Prize background as co-author, with Emil Konopinski, of the 1953 lepton-number postulate at Indiana University.

Hanna Neumann

Hanna Neumann, born Johanna von Caemmerer (1914–1971), was a German-born Australian group theorist, the first woman Professor of Mathematics in Australia, and the namesake of the Hanna Neumann conjecture, proved in 2011.

Hannah Cairo

Hannah Cairo, also known as Hannah Mira Cairo, is a Bahamian-born mathematician who disproved the 40-year-old Mizohata–Takeuchi conjecture in 2025 at age 17 and began a mathematics Ph.D. at the University of Maryland in fall 2025.

Hannah Dietterich

Hannah Dietterich is an American research geophysicist and volcanologist at the USGS Alaska Volcano Observatory in Anchorage, a recipient of the Presidential Early Career Award.

Hannah Fry

Hannah Fry is a British mathematician, author, and broadcaster known for mathematical models of human behavior and her viral TED talk on the mathematics of love.

Hannes Alfvén

Hannes Olof Gösta Alfvén (1908–1995) was a Swedish plasma physicist who founded magnetohydrodynamics, predicted the Alfvén wave in 1942, and won a share of the 1970 Nobel Prize in Physics.

Hannes Jónsson

Hannes Jónsson is an Icelandic theoretical chemist and professor at the University of Iceland known for the climbing-image nudged elastic band and dimer methods for finding saddle points in atomic-scale simulations.

Hanns-Christoph Nägerl

Hanns-Christoph Nägerl, born 1967, is a German experimental physicist and full professor at the University of Innsbruck known for ultracold atoms, molecules, and quantum many-body physics.

Hans Ågren

Hans Ågren, born 1950 in Skellefteå, Sweden, is a Swedish theoretical chemist known for X-ray spectroscopy theory, who held the Theoretical Chemistry chair at KTH from 1998 to 2017.

Hans Andersag

Hans Andersag, born Johann Josef Andersag in 1902, was a German chemist at Bayer who synthesized the antimalarial chloroquine in 1934, though Bayer shelved it as too toxic.

Hans Bethe

Hans Bethe, also known as Hans Albrecht Bethe, was a German-American nuclear physicist who explained how stars produce energy and won the 1967 Nobel Prize in Physics.

Hans Busch

Hans Busch (1884–1973) was a German physicist who founded electron optics, showing in 1927 that a magnetic coil acts on electrons as a lens, enabling the electron microscope.

Hans Carl Friedrich von Mangoldt

Hans Carl Friedrich von Mangoldt (1854–1925) was a German mathematician who rigorously proved Riemann's explicit formula in 1895, introduced the von Mangoldt function, and helped prove the prime number theorem.

Hans Christian Ørsted

Hans Christian Ørsted (1777–1851) was a Danish physicist who discovered in 1820 that an electric current deflects a compass needle, the first link between electricity and magnetism.

Hans Cloos

Hans Cloos (1885–1951) was a German geologist who pioneered granite tectonics and wet-clay model experiments of rock deformation, held the geology chair at Bonn from 1926, and wrote Conversation with the Earth.

Hans Ferdinand Mayer

Hans Ferdinand Mayer was a German physicist and Siemens engineer who anonymously passed the 1939 Oslo Report on German military research to British intelligence, revealed in 1989.

Hans Fischer

Hans Fischer was a German organic chemist who won the 1930 Nobel Prize in Chemistry for working out the structure of haemin and chlorophyll and synthesizing haemin in 1929.