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Sample of heavy water, 1950-1970.

Sample of heavy water, 1950-1970.
4 0 c m
actual image size: 25cm x 32cm


A sealed glas phial containing 25 grammes of heavy water. Heavy water contains the isotope deuterium instead of hydrogen and is used to control neutrons during a nuclear reactor's chain reaction. It is 11 percent heavier than ordinary water and has a relative molecular mas of 20, as compared to 18 for ordinary water.

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© Science Museum / Science & Society Picture Library

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