sir humphrey davy

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تعريف sir humphrey davy في الإنجليزية الإنجليزية القاموس.

a British scientist who invented the Davy lamp, an oil lamp that could be used in coal mines without causing explosions. He also discovered several elements (=basic chemical substances) , including calcium, sodium, and potassium (1778-1829)

الواصلة

sir Humph·rey Da·vy