Give two ways to prove that liquids, like water, are matter. (AKA "How are liquids, like water, are/is matter?"; "How is liquid a state of matter?") The questions mean the same thing. I just put it there so some people won't get confused.

Liquids will flow and fill the lowest portion of a container, taking on the shape of the container but not changing in volume. The limited amount of space between particles means that liquids have only very limited compressibility.

distance, luminosity, brightness, radius, chemical composition, and temperature