The final state is a gas, because the substance can fill the container.
The atoms in a gas have the most noteworthy vitality of the three states and the particles are sufficiently far from one another to allow that they move uninhibitedly and fill the compartment.
The initial state is solid, because the particles cannot slide past one another.
The particles in a strong are firmly pressed and can vibrate however not translate, while in fluid express the particles are close but can move all the more openly and can slide past each other.
So, the change described is from solid to gas.
