Final answer:
Methanol is the substance being referred to in the question. Its low boiling point makes it useful in automatic sprinkler systems.
Step-by-step explanation:
The substance being referred to in the question is methanol (CH3OH), which is a common solvent with a low boiling point. Methanol has a boiling point of 34.6 °C, which makes it useful in automatic sprinkler systems that are designed to activate at high temperatures. When the temperature rises and methanol reaches its boiling point, it vaporizes and activates the sprinkler system.