= Meissner state
{c}
A <Meissner state> is an equilibrium state of <superconductivity> without <quantum vortex> penetration, with screening <electric currents> responding to the applied <magnetic field>. In a solid, <simply connected> sample much thicker than the <London penetration depth>, the deep interior <magnetic field> is approximately zero. This is a statement about a phase and a geometry, not a rule that every sample exhibiting <superconductivity> always has $\mathbf B=0$. In particular, the <Meissner state> exists for sufficiently weak <magnetic fields> in both <type-I superconductors> and <type-II superconductors>. <University Physics Volume 3 by Samuel J. Ling and others/9.8 Superconductivity>[§9.8, Properties of Superconductors, paragraphs distinguishing type I, type II and their two critical fields]{ref}
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