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September 30, 2021
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feb 28, 1970 - Law of Definite Proportions is discovered

Description:

Chemical compounds always contain the same elements in the exact same proportions by mass.

Added to timeline:

7 Nov 2017
0
0
213
Atomic timeline - Noah Turnquist and Trent Oberreit

Date:

feb 28, 1970
Now
~ 51 years ago
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