1 kg não pesará mais 1 kg – como conhecemos – a partir de 2019

A partir de 2019, 1kg não pesará mais 1kg, pelo menos não como conhecemos hoje. A razão é que o quilo representa uma das quatro unidades básicas de medida – juntamente com o ampére, kelvin e mol – e elas serão redefinidas pela Conferência Geral sobre Pesos e Medidas em novembro de 2018, segundo informações publicadas pela BBC Brasil

A Conferência será a maior revisão do Sistema Internacional de Unidades desde a sua criação em 1960. Atualmente, o quilo é definido por um objeto: um cilindro de 4cm de platina e irídio fabricado em Londres e guardado em um cofre na França desde 1889.

No entanto, esse quilo original perdeu 50 microgramas em 100 anos, porque os objetos podem facilmente perder átomos ou absorver moléculas do ar e, como todas as balanças do mundo são graduadas de acordo com esse quilo original, acabam gerando dados incorretos.

Ainda que essa revisão não tragam mudanças perceptíveis na vida cotidiana, essas mínimas diferenças são importantes em cálculos científicos que exigem extrema precisão, principalmente na engenharia.

 

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