Solid (state of matter)
Solids at their respective melting points change to liquids. Solids can vaporize directly into a gas in a process called sublimation. Examples of this are dry ice becoming carbon dioxide gas, and ice disappearing without melting.
Some of the properties of a solid are: Young's modulus, which is a measure of how a solid responds to deformation; hardness, which is a measure of how a solid resists abrasion; and melting point, which is the temperature at which a solid becomes a liquid.