Part 3/19:
For example, a gold bar weighing a certain amount on Earth’s surface appears to be a precise measure of its gold quantity. However, in space, weight becomes meaningless—on the International Space Station or in a free-fall environment, the gold bar and a feather weigh virtually nothing. Yet, the amount of gold remains unchanged. This contradiction exposes weight as a false measure of quantity. It’s a doppelganger—seemingly related to the actual property (mass), but ultimately misleading.