Constant (Planck)

The unit kilogram (kg) is defined by fixing Planck's constant to be equal to

h = 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