We understand the weight of something heavy when opposed to something light. For example, we know the difference between say, the weight of a feather and the weight of a brick.

Sometimes we expect something to be heavy until we lift it and we’re surprised that it’s light. And then we say to ourselves, “That wasn’t so bad.”
Sometimes, this goes the other way around, which means we understand the physical nature of gravity. But there’s a different kind of gravity.