Corrected version from October 3, 2025 - First published on February 2, 2022. In this experiment (WEP), in addition to a pure solid body, namely a metal disk, a solid body in hollow form filled with gas, specificallya helium balloon, has been studied during free fall in a vacuum (low vacuum). The analysis of the measured data showed a clear deviation of the measured values from the expected nominal values according to Galileo’s law of falling bodies during free fall of the helium balloon. However, it was clearly stated in thefirst version of the article that the experiment carried out here was conducted with simple, modest means, and it was recommended or intended to repeat the experiment with better measurement technology. Another drop test with a helium balloon was carried out using better measuring technology on August 1, 2002, in the 2.2 Second Drop Tower at the NASA Glenn Research Center. In this experiment, the equivalence principle (SEP) was confirmed. However, this information was not known at the time of the article’s initialpublication and is hereby added for clarification. In conclusion, it can be assumed that the experiment described in the article does not violate the equivalence principle; the measurement was probably flawed due to air resistance, which caused the helium balloon to fall to the ground more slowly than expectedaccording to Galileo’s law of falling bodies. Since the general theory of relativity is based on the equivalence principle, it will continue to be useful in the future to carry out all possible experiments to verify whetherthe equivalence principle is still valid.