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il a prévu de kirchhoff et bunsen en indiquant que les lignes spectrales sont caractéristiques pour chaque substance chimique.
he anticipated kirchhoff and bunsen in indicating that spectral lines were characteristic for each chemical substance.
instruments invention du spectroscope par le chimiste allemand robert wilhelm bunsen et le physicien allemand gustav robert kirchhoff.
instruments german chemist robert wilhelm bunsen and german physicist gustav robert kirchhoff invent the first spectroscope.