* Freezing Point: Liquids transition to solids by lowering their temperature below their freezing point. Each substance has a specific freezing point.

* Other Factors: Some substances, like gases, can be directly changed to solids through a process called deposition, bypassing the liquid state. There are also substances that decompose or react chemically before they can solidify.

Examples:

* Water: Easily freezes into ice at 0°C (32°F).

* Mercury: Freezes at -38.83°C (-37.89°F), making it a liquid at room temperature.

* Helium: Helium remains a liquid even at extremely low temperatures, requiring extreme pressure to solidify.

In summary: While many liquids can be changed to solids by lowering the temperature, some liquids either have very low freezing points or undergo other transformations before solidifying.