Kinetic energy normalization for MAS.
Alias for W. The kinetic and pressure-volume energy scales are identical
since \(K_0 = \tfrac{1}{2}\rho_0 V_0^2 L_0^3 = \tfrac{1}{2} P_0 L_0^3\);
the factor of one-half is absorbed into the code-unit kinetic energy.
