Which of the following will stay constant, no matter if the substance is in the solid, liquid, or gas state?

volume
shape
temperature
mass

i dont know math science that much

The mass of any substance will remain the same regardless of its state of matter. Using water as an example, its volume increases when it is boiled to a gas or when it is frozen from a liquid state to the solid state ice. The volume and temperature will change as it moves through the states of matter, however the amount of individual molecules of oxygen and hydrogen that form water will remain the same and this constitute mass.