  Gravitational-wave detections of black hole mergers in binary systems offer
an excellent opportunity to test the 2nd law of black hole thermodynamics. In
this paper, we review how the entropy of any astrophysical black hole is
calculated and we use LIGO and VIRGO's mass and spin data measurements from
black hole merger events detected over the past years to perform entropy
calculations and numerically test the generalized 2nd law of thermodynamics.
Besides, we analyze the mathematical correlation between the black hole merger
event's initial parameters to prove and conclude that the theorem will always
hold.
