31 июл 1777 г. - Antonie De Lavoisier
Описание:
Defined the word element as a pure substance that could not be chemically broken down into similar substances. Discovered 23 elements and recognized mixtures exist and identified air as a mixture of oxygen and some other gas.Добавлено на ленту времени:
Дата:
31 июл 1777 г.
Сейчас
~ 248 г назад