When you add 1kg of some stuff to 1kg of another stuff and end up with 1.97kg instead of 2kg, have you really falsified 1 + 1 = 2, or have you just confirmed th

When you add 1kg of some stuff to 1kg of another stuff and end up with 1.97kg instead of 2kg, have you really falsified 1 + 1 = 2, or have you just confirmed that some portion of your material was vaporized in the reaction? What does the number 1.97 even mean in a world where 1 + 1 ≠ 2? When you falsify 1 + 1 = 2, you also end up denying the validity of the very experiment that you used in the process. If a hypothesis can only be falsified by self-invalidating experiments, does it count as falsifiable?