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In a bid to review the International System of Units (SI), the International Bureau of Weights and Measures gathered at the 26^th General Conference on Weights and Measures on November 16, 2018. Sixty member states have voted for changing four out of seven basic units of measurement. The kilogram is among the modified. Before describing the key points, let us have a closer look into the kilogram and its history.

Martín Zapater y Clavería, born in Zaragoza on November 12th 1747, came from a family of modest merchants and was taken in to live with a well-to-do aunt, Juana Faguás, and her daughter, Joaquina de Alduy. He studied with Goya in the Escuelas Pías school in Zaragoza from 1752 to 1757 and a friendship arose between them which was to last until the death of Zapater in 1803. 

When the Royal Academy of Arts offered Stephen Chambers the opportunity to produce new work for a focused exhibition in the Weston Rooms of the Main Galleries, Chambers turned to print and the possibilities it offered.