In terms of physical states, which state of matter has no definite volume and no definite shape?

The correct response highlights that gases possess unique characteristics distinct from other states of matter. Gases do not have a definite volume or shape, which allows them to expand and fill their containers completely. This occurs because the particles in a gas are much farther apart compared to solids and liquids, leading to much greater kinetic energy.

In solids, particles are closely packed and stay in fixed positions, resulting in a definite volume and shape. Liquids have a definite volume but take the shape of their container, as the particles are still close but can move around each other. Plasma, on the other hand, is an ionized state of matter with charged particles and is typically found at extremely high energies, where it exists in stars and certain types of flames, but it still maintains its own specific characteristics compared to gases.

Thus, the defining quality of gases is their ability to both change shape and volume to match their container, making them the state of matter with no definite volume or shape.