Constant (Planck)

The unit kilogram (kg) is defined by fixing Planck's constant h to be equal to 6.626,070,15×10^-34 J·s (= kg·m² ·s^-1 ), where second and meter are defined in terms of atomic clock and speed of light.

The constant is named after the German physicist Max Karl Ernst Ludwig Planck (1858 – 1947).

Related concepts

• base units
• constant (atomic clock)
• constant (Avogadro)
• constant (Boltzmann)
• constant (electron charge)
• constant (speed of light)
• kilogram
• mass