1945 in science

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… 1935 • 1936 • 1937 • 1938 • 1939 • 1940 • 1941 • 1942 • 1943 • 1944 – 1945 – 1946 • 1947 • 1948 • 1949 • 1950 • 1951 • 1952 • 1953 • 1954 • 1955 …
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… 1942 • 1943 • 1944 – 1945 – 1946 • 1947 • 1948 … … 1910s • 1920s • 1930s – 1940s – 1950s • 1960s • 1970s … … 19th century – 20th century – 21st century …
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The year 1945 in science and technology involved some significant events, listed below.

[edit] Biology

November - Assembly of the world's first general purpose electronic computer, the Electronic Numerical Integrator Analyzer and Computer (ENIAC), is completed. It covers 1800 feet of floor space. The first set of calculations is run on the computer.

High-altitude west-to-east winds across Pacific, discovered by Japanese in 1942 and by Americans in 1944, are dubbed "jet stream"

July 16 - Nuclear testing: The Trinity test, the first test of an atomic bomb, using 6 kilograms of plutonium, succeeds in detonating, unleashing an explosion equivalent to that of 20 kilotons of TNT.
August 6 and 9 – Atomic bombings of Hiroshima and Nagasaki, and the world becomes first aware of the power of nuclear weapons.
August 11 – Smyth Report released by U.S. government, informing the public of the basics of nuclear fission and its military and civilian applications. Emphasizes the role played by physics in the development of the atomic bomb.
Team led by Charles DuBois Coryell discovers chemical element 61, the only one still missing between 1 and 96 on periodic table. New element is called promethium.