GBB-F-005896-0000 1845 ca, ITALY : The italian Doctor AMEDEO AVOGADRO (1776 - 1856) Count of Quaregna and Cerreto. Avogadro was an Italian scientist, most noted for his contribution to molecular theory now known as Avogadro's law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. In tribute to him, the number of elementary entities (atoms, molecules, ions or other particles) in 1 mole of a substance, 6.02214179 (30)1023, is known as the Avogadro constant, one of the seven SI base units and represented by NA Credit: © ARCHIVIO GBB / Archivi Alinari WARNING: Permission must be required for non editorial use. Please contact Alinari Archives Collection: © ARCHIVIO GBB / Archivi Alinari Object type: digital image Photographic technique: P digital image Technical info Image sizes (pixel): 2684 X 3906 Image sizes (cm at 300 dpi): 22 X 33 Image sizes (MB): 2.17 Color space: RGB