Which of the following best defines thermometry?

The correct definition of thermometry is found in the choice that states it is the science of measuring temperatures. Thermometry involves the methods and techniques used to determine temperature, which is crucial in a variety of scientific and practical applications, including fire and explosion investigations. Understanding temperature is vital in these contexts because it helps investigators assess heat sources, the movement of heat in fire scenarios, and the potential for ignition, providing insight into the fire’s development and behavior.

The other options do not pertain to thermometry. Understanding fire causes, fire suppression techniques, and the analysis of combustion products are important aspects of fire investigation, but they specifically address different domains within the field. Fire cause analysis focuses on identifying what ignited the fire, fire suppression involves methods used to extinguish fires, and combustion product analysis examines the substances released during burning. Each serves its own purpose in fire science, but only thermometry directly pertains to temperature measurement.