2-group global symmetries, hydrodynamics and holography

2-group global symmetries are a particular example of how higher-form and conventional can fuse together into larger structure. We construct theory hydrodynamics describing the finite-temperature realization symmetry composed out U(1) U(1) zero-form one-form symmetries. study aspects thermodynamics from Euclidean partition function derive constitutive relations for ideal various points view. Novel features resulting include an analogue chiral magnetic effect sound mode propagating along field lines. also discuss minimalist holographic description dual to verify predictions hydrodynamic descriptions. Along way we clarify some breaking in theories at finite temperature.