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1 day ago · The 1871 periodic table constructed by Dmitri Mendeleev. The periodic table is one of the most potent icons in science, lying at the core of chemistry and embodying the most fundamental principles of the field. The history of chemistry represents a time span from ancient history to the present. By 1000 BC, civilizations used technologies that ...
1 day ago · In chemistry and optical engineering, photons are usually symbolized by hν, which is the photon energy, where h is the Planck constant and the Greek letter ν is the photon's frequency. Physical properties. The photon has no electric charge, is generally considered to have zero rest mass and is a stable particle.
1 day ago · The simplest definition of "paleontology" is "the study of ancient life". The field seeks information about several aspects of past organisms: "their identity and origin, their environment and evolution, and what they can tell us about the Earth's organic and inorganic past". Historical science
59 minutes ago · Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the formula N H 3.A stable binary hydride and the simplest pnictogen hydride, ammonia is a colourless gas with a distinctive pungent smell.
- NH₃
- 47% w/w (0 °C), 31% w/w (25 °C), 18% w/w (50 °C)
- 17.031 g·mol−1
- −77.73 °C (−107.91 °F; 195.42 K) (Triple point at 6.060 kPa, 195.4 K)
1 day ago · Daniel Spielman (B.S. 1992), MacArthur Fellow, Godel, Polya and Nevanlinna Prize Winner, Applied Mathematics and Computer Science professor at Yale University. John Griggs Thompson (B.A. 1955), mathematician, winner of the Fields Medal in 1970.
1 day ago · A Doctor of Philosophy ( PhD, Ph.D., or DPhil; Latin: philosophiae doctor or doctor philosophiae) is the most common degree at the highest academic level, awarded following a course of study and research. The degree is abbreviated PhD and sometimes, especially in the U.S., as Ph.D. It is derived from the Latin Philosophiae Doctor, pronounced as ...
1 day ago · Doctorate. A doctoral diploma awarded by the State University of New York at Buffalo. A doctorate (from Latin doctor, meaning "teacher") or doctoral degree is a postgraduate academic degree awarded by universities and some other educational institutions, derived from the ancient formalism licentia docendi ("licence to teach").
