A thermostatic detector is sensitive to which of the following?

A thermostatic detector is specifically designed to respond to changes in temperature, making it sensitive to heat. These detectors function by monitoring the ambient temperature and activating when the temperature exceeds a predetermined threshold, which indicates a potential fire condition.

The effectiveness of thermostatic detectors lies in their ability to sense rapid increases in heat, typical of a fire scenario, making them crucial safety devices in environments where fire hazards exist. This response mechanism differentiates them from other types of detectors that are responsive to smoke particles, gas emissions, or light levels. Each of these other options represents different safety technologies and their respective detection methods but does not relate to the operational principle of thermostatic detectors.