Many substances can undergo a phase change from a solid to a liquid to a gas when the appropriate conditions are met. This phenomenon is known as "changing states" or "phase transitions." The most common example is water, which can exist as a solid (ice), a liquid (water), or a gas (water vapor) depending on temperature and pressure.
By applying heat, a solid can be heated to its melting point, at which it transitions into a liquid. Further heating can turn the liquid into a gas through a process called vaporization or boiling. The reverse processes—condensation and freezing—occur when a gas or liquid loses heat and transitions to a liquid or solid, respectively.
It's important to note that not all substances exhibit the same behavior. The specific temperature and pressure at which phase transitions occur vary for different substances, depending on their molecular or atomic properties. For example, other substances like carbon dioxide (CO2) can undergo a phase change from solid (dry ice) directly to a gas (sublimation) without becoming a liquid at standard atmospheric pressure.
In summary, the ability to change from a solid to a liquid to a gas and vice versa is a characteristic of many substances, with the specific conditions required for each substance depending on its unique properties.