A shape is intangible, it's just an outline or configuration of something else. So it is neither a solid, liquid, or gas... it isn't matter.
However, I do think you mean to say, "Which forms a definite shape: a solid, liquid, or gas?". In this case, only a solid has a definite shape. Liquids and gases take on the shape of its container, which can vary. Solids are the only state of matter that have their own shape, not dependent on a container.
Solid
Superfluidity
These are the three common states of matter. A liquid has a definite volume but takes the shape of its container, a solid has both definite shape and volume, and a gas has neither definite shape nor volume.
sublimation deposition SOLID ============> GAS ==============> SOLID melting freezing SOLID ============> LIQUID =============> SOLID (solidfication) condensation vaporization GAS =============> LIQUID =============> GAS
Marshamallow is a gas and a solid cause it has a shape and it contains many bubbles in it.
Marshamallow is a gas and a solid cause it has a shape and it contains many bubbles in it.
a solid has definite volume and shape, a liquid has definite volume but no shape. a gas has nor volume nor shape
Pebbles are solid.
Solids.
solid melts to liquid and liquid boils to solid
The three states of matter are solid, liquid, and gas. Solids have a fixed shape and volume, liquids have a definite volume but take the shape of their container, and gases have neither a definite shape nor volume.
milk scientifically a Solid