SI Units

Joule

Definição

A unidade de energia do SI, igual ao trabalho realizado por uma força de um newton ao longo de um metro (1 J = 1 N·m = 1 kg·m²/s²).

Explicação

Named after physicist James Prescott Joule. Lifting a 100 g apple by 1 meter requires approximately 1 joule of energy. A food calorie (kcal) equals 4,184 joules; a AA battery stores about 9,000 J; an average human daily caloric intake of 2,000 kcal equals roughly 8.4 million joules.

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RELATED CONVERSIONS

Joule → Kilojoule Joule → Megajoule Joule → Calorie (thermochemical) Joule → Kilocalorie Joule → Watt-hour Joule → Kilowatt-hour
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RELATED TERMS

Metro

A unidade de comprimento de base do SI, definida como a distância que a luz percorre em 1/299.792.458 de segundo.

Quilograma

A unidade de massa de base do SI, definida por meio da constante de Planck.

Segundo

A unidade de tempo de base do SI, definida com base nas oscilações do átomo de césio-133.

Kelvin

A unidade de temperatura termodinâmica de base do SI, cujo ponto de origem é o zero absoluto.

Ampere

A unidade de corrente elétrica de base do SI.