What type of alarm can be triggered by thermal changes?

A fire alarm is specifically designed to detect thermal changes associated with the presence of fire. These alarms often use heat sensors, which can identify rapid increases in temperature, or they may feature smoke detectors that sense smoke particles—many of which are products of combustion. When the heat or smoke threshold is exceeded, the alarm is triggered, indicating a potential fire hazard.

In contrast, intrusion alarms are mainly focused on detecting unauthorized entry into a premises, glass break detectors respond to the sound or vibration of breaking glass, and while smoke alarms deal with smoke, they are not necessarily sensitive to thermal changes in the same direct manner that fire alarms are designed to be. Thus, the ability of fire alarms to respond specifically to thermal changes makes them the correct answer for this question.