Important Events of December – 18
J.J. Thomson Birth Anniversary
- Sir Joseph John Thomson Born on 18th December 1856 in Monsester.
Sir Joseph John Thomson was an English physicist and Nobel Laureate in Physics, credited with the discovery and identification of the electron; and with the discovery of the first subatomic particle.
In 1897, Thomson showed that cathode rays were composed of previously unknown negatively charged particles (now called electrons), which he calculated must have bodies much smaller than atoms and a very large charge-to-mass ratio. Thomson is also credited with finding the first evidence for isotopes of a stable (non-radioactive) element in 1913, as part of his exploration into the composition of canal rays (positive ions). His experiments to determine the nature of positively charged particles, with Francis William Aston, were the first use of mass spectrometry and led to the development of the mass spectrograph.
Thomson was awarded the 1906 Nobel Prize in Physics for his work on the conduction of electricity in gases.
Death: August 30, 1940
International Migrants Day
International Migrants Day is observed on 18 December in accordance with Resolution 55/93 of the United Nations General Assembly, adopted on 4 December 2000.
On 18 December 1990, the General Assembly had adopted a resolution on the International Convention on the Protection of the Rights of All Migrant Workers and Members of their Families (resolution 45/158).
This day is observed in many countries, intergovernmental and non-governmental organizations through the dissemination of information on human rights and fundamental political freedoms of migrants, and through sharing of experiences and the design of actions to ensure the protection of migrants.
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