The temperature of a pure solid substance is not a single, fixed value. It's more accurate to say that a pure solid substance has a temperature range within which it exists as a solid.

Here's why:

* Melting Point: Every pure solid has a specific melting point. This is the temperature at which the solid transitions to a liquid. Below this point, the substance is solid.

* Heat Capacity: Solids can absorb heat energy, causing their temperature to rise. So, a solid's temperature can fluctuate within its solid state range, depending on how much heat it has absorbed.

Example:

* Water ice has a melting point of 0°C (32°F). So, a piece of ice could be -10°C, -5°C, or even -1°C and still be solid. However, if it reaches 0°C, it will start to melt.

Important Note: The temperature of a pure solid substance can also be influenced by factors like:

* Pressure: Pressure can affect the melting point.

* Impurities: Impurities can lower the melting point of a substance.

Therefore, it's more accurate to talk about the temperature range of a pure solid substance rather than a single, fixed temperature.