Kinetic magnetohydrodynamic momentum equation
= Kinetic magnetohydrodynamic momentum equation
{title2=$\rho D_t\mathbf u=-\nabla\cdot\mathbf P+(\nabla\times\mathbf B)\times\mathbf B/(4\pi)$}
In <Gaussian units>, the equation in the title uses the gyrotropic <pressure tensor> $\mathbf P=p_\perp\mathbf I+(p_\parallel-p_\perp)\mathbf b\mathbf b$. This allows <pressure anisotropy>. Its magnetic force contains both <magnetic pressure> and <magnetic tension>.