system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When they say that human body is made of 73% water, does they mean actual "H2O" aka water, or just liquid in general?
gpt
They mean actual water. Think of soda; it's predominantly water, right? However, it's got plenty of stuff dissolved in it.

Cells are (and this is simplifying a lot) basically water balloons filled with soda. You've got a membrane which keeps all of the soda in. This soda is mostly water with the proteins and stuff your body needs dissolved into it.