Perpendicular plasma pressure
= Perpendicular plasma pressure
{title2=$p_\perp=m\int(v_\perp^2/2)f\,d^3v$}
The equal normal <stresses> in the two directions perpendicular to the local <magnetic field> for a gyrotropic <phase-space distribution function>. The factor one half averages the two perpendicular <velocity> components. With <first adiabatic invariant> $\mu=v_\perp^2/(2B)$, the integrand is $m\mu Bf$.