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This work presents and characterizes the existence of two different regimes in the spreading and breakup of liquid flat-fan sheets when discharging in low-density atmospheres. The motivation of the study is the improvement on the absorption phenomena of lithium bromide aqueous solution when discharging in a 600&-1,500 Pa water vapor environment. This corresponds to the absorber conditions in current absorption closed-cycle cooling machines. Despite this, the dimensionless characterization obtained has universal validity. The conditions that define the change in the break-up regime, the dimensionless sheet break-up length and the break-up time are given as a function of the parameters involved. Digital particletracking velocimetry (PTV) has been applied to measure the velocity field and additional visualization techniques have been used to further characterize the break-up process.The experiments verify the existence of critical gastoliquid density and viscosity ratios below which gas to liquid interaction becomes negligible. The article alsooffers expressions that define their values as a function of the other dimensionless parameters.