It's important to note that this isn't a single temperature for all substances. Each substance has its own unique freezing point.

Here are some examples:

* Water: 0 degrees Celsius (32 degrees Fahrenheit)

* Mercury: -38.83 degrees Celsius (-37.89 degrees Fahrenheit)

* Ethanol: -114.1 degrees Celsius (-173.4 degrees Fahrenheit)

Let me know if you'd like to know the freezing point of a specific substance!