Aston's quartz microbalance, c 1919.
2 8 c m
actual image size: 32cm x 20cm

Aston's quartz microbalance, c 1919.

© Science Museum / Science & Society Picture Library


F W Aston (1877-1945) was an English chemical physicist who devised a way to separate atoms of similar mas and measure these mases accurately. He showed clearly that over fifty elements consisted of atoms of similar but different atomic mas, but the same atomic number. These are known as isotopes.

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