April 18 in Physics History
Physics history will help you to develop a better understanding of the physics world!
birthdays & deaths
Explore all birthdays & deaths of physicists occurred on this day with their short biography!
physics Events
Know all important discoveries made by physicists & events happened on this day with complete information!
April 18 in Physics History - Births – Physicists born on April 18
H.L. Callendar (18 Apr 186 - 21 Jan 1930)
He was an English physicist who published the first-ever steam table in 1915. He was known for his work in thermometry, calorimetry, and the thermodynamic properties of steam. He also invented the platinum residence thermometer used in the electrical resistivity of platinum, radio balance, and rolling chart thermometer.
Maurice Goldhaber (18 Apr 1911 -11 May 2011)
He was an Austrian American physicist who devised an experiment to show that neutrinos always rotate in the only counterclockwise direction. His method did not involve the use of an accelerator instead he used simple and elegant apparatus. He oversaw experiments at the Brookhaven National Laboratory in New York which led to 3 Nobel Prizes. He also discovered that the nucleus of the deuterium atom consists of a proton and a Neutron.
April 18 in Physics History - Deaths – Physicists died on April 18
Albert Einstein (14 Mar 1879 - 18 Apr 1955)
He was a German-American physicist who developed the social and general theories of relativity and won the Noble Prize for physics for his explanation of the photoelectric effect in 1921. Einstein advanced a series of theories that proposed entirely new ways of thinking about space, time, and gravitation. His theory of relativity and gravitation revolutionized scientific and philosophic inquiry. Einstein died in April 1955 from an abdominal aortic aneurysm. He has requested that his body be cremated but in a bizarre incident, pathologist Thomas Harvey removed his brain during his autopsy and kept it to study and unlock the secret of this genius. After Einstein’s son’s approval, he cut his brains into pieces, and a handful of studies have been conducted on it since the 1980s.
John Ambrose Fleming (29 Nov 1849 - 18 Apr 1945)
He was an English electrical engineer who coined the name for the diode which he invented. It acted only as a rectifier as it was a vacuum tube with two electrodes in which the electrons flowed from filament to anode only. It means that the current was being restricted to flow in only one direction. For an AC, only the positive half of the waves were passed rectifying from AC to DC. It was used in the telecommunication industry.
Édouard Roche (17 Oct 1820 - 18 Apr 1883)
He was a French mathematical astronomer who was the first to propose a model of the earth with a solid core. He determined the Roche Limit for satellites that says smaller bodies could not lie within 2.44 radii of the larger body without breaking apart from the effect of the gravitational force between them. He studied the internal structure of celestial bodies and later he showed the instability of a rapidly rotating lens-shaped body.
