Here's why:

* Decomposition: Hydrogen peroxide readily decomposes into water (H₂O) and oxygen gas (O₂) at higher temperatures. This decomposition happens faster at higher temperatures.

* Boiling Point: The boiling point of hydrogen peroxide is 150.2 °C (302.4 °F). This means it needs to be heated significantly to reach its boiling point and vaporize.

Therefore, it's not about hydrogen peroxide becoming "volatile" in the traditional sense. Instead, it's more about its instability and tendency to decompose at higher temperatures.

Important note: Due to its decomposition, storing hydrogen peroxide at high temperatures is discouraged. It should be stored in a cool, dark place.