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jan 1, 1809 - Thomas Forster observed with a theodolite the drift of small free pilot balloons filled with "inflammable gas" Gay-Lussac's law (gas law, relating temperature and pressure)
Added to timeline:
Hydrogen Tech
By
Yehuda
2 Sep 2017
0
0
1422
Date:
jan 1, 1809
Now
~ 216 years ago
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