The relative distances between each atom increases, as do their respective energy levels (i.e. move faster).
When a substance changes from a solid to a gas, called sublimation, it quickly becomes less dense.
It sublimes
A change from gas to liquid, from solid to liquid, from liquid to gas, etc.
The substance a wave travels through is called a medium. This medium can be solid, liquid, or gas, and it allows the wave to propagate by transferring the energy from one particle to the next.
During changes between a solid and a gas, a substance undergoes sublimation or deposition. Sublimation occurs when a solid turns directly into a gas without passing through the liquid phase, whereas deposition is when a gas turns directly into a solid without becoming a liquid first.
The process of a substance turning from gas to solid is called deposition. This occurs when gas molecules lose energy and come together to form a solid.
Gas
When a solid, liquid , or gas is dissolved in another substance, the result is a solution.
When a substance changes from a gas to a liquid to a solid, the particles transition from being far apart and moving freely in a gas to closer together but still able to slide past each other in a liquid, and finally tightly packed in a regular pattern in a solid. The energy of the particles decreases as they transition from gas to liquid to solid.
Boiling a solid substance directly does not affect its pressure. However, when a solid substance boils and turns into a gas, the pressure can increase due to the expansion of the gas molecules.
A substance which changes state directly from a solid to a gas is said to have sublimed.
When a substance goes from a gas to a solid it is called deposition.