Earth's Outer Core
The fluid interior layer of Earth ~2,260 km thick composed of liquid iron-nickel alloy surrounding the solid inner core.
Governing formula
Radius ~ 3480 km to 1220 km (Liquid Iron-Nickel Alloy)
SI unit
Pa·s (Liquid Viscosity ~10⁻³ Pa·s)
In depth
S-waves cannot propagate through the liquid outer core (creating a seismic S-wave shadow zone). Thermal and compositional convection in this electrically conductive fluid powers the geodynamo that generates Earth's magnetic field.
Examples in the real world
Seismic S-wave shadow zones between 104° and 140° distance confirming the outer core is liquid.