gas
SHAPE
A gas can change shape but it doesn't change volume, a liquid also changes shape but doesn't change volume.
the answer is liquid... as my science teacher says.
A fluid has a definite volume, but it does NOT have a definite shape: its shape changes depending on the container it is in.
Shape, mass or volume.
liquid
Stress
The state of matter that keeps the same volume but changes shape when it changes container is a liquid. Liquids do not have a fixed shape but take the shape of their container due to their ability to flow and fill the container.
a liquid
A gas.
Gases do that.
This is a liquid phase.