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An experimental study is presented, about transitions between Non-EquilibriumSteady States (NESS) in a dissipative medium. The core device is a smallrotating blade that imposes cycles of increasing and decreasing forcings to agranular gas, shaken independently. The velocity of this blade is measured,subject to the transitions imposed by the periodic torque variation. TheHatano-Sasa equality, that generalises the second principle of thermodynamicsto NESS, is verified with a high accuracy (a few $10^{-3}$), at differentvariation rates. Besides, it is observed that the fluctuating velocity at fixedforcing follows a generalised Gumbel distribution. A rough evaluation of themean free path in the granular gas suggests that it might be a correlatedsystem, at least partially.

The Hatano-Sasa equality: transitions between steady states in a granular gas