alb3815964

National Standard of Mass, Kilogram

This platinum-iridium cylinder at the National Bureau of Standards is the primary standard kilogram for all metric measurements of mass in this country. It was furnished to the US by the International Bureau of Weights and Measures in accordance with the metric treaty of 1875. Recomparison with the international standard in 1937 showed that the US standard had changed by only one part in 50 million during approximately 50 years. Known as Kilogram No. 20, it is 39mm in diameter and 39mm high, and is made of an alloy containing 90% platinum and 10% iridium.

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Título:

National Standard of Mass, Kilogram

Descripción: Ver traducción automática

This platinum-iridium cylinder at the National Bureau of Standards is the primary standard kilogram for all metric measurements of mass in this country. It was furnished to the US by the International Bureau of Weights and Measures in accordance with the metric treaty of 1875. Recomparison with the international standard in 1937 showed that the US standard had changed by only one part in 50 million during approximately 50 years. Known as Kilogram No. 20, it is 39mm in diameter and 39mm high, and is made of an alloy containing 90% platinum and 10% iridium.

Personas:

MASS

Crédito:

Album / Science Source / Omikron

Autorizaciones:

Modelo: No - Propiedad: No
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Tamaño imagen:

2512 x 3115 px | 22.4 MB

Tamaño impresión:

21.3 x 26.4 cm | 8.4 x 10.4 in (300 dpi)

Palabras clave:

1875 • 20 • CIENCIA • COLOREADA • ESTÁNDAR • HISTORIA • HISTORICO • INSTITUO • KILOGRAMO • MASS • MEDIDA • MEJORA • METROLOGIA • NACIONAL • NORMAS • PESA • PESOS • QUILOGRAMO • S. XX • SIGLO XX • SIGLO • SISTEMA • TECNOLOGÍA