
362 Forensic Engineering Fundamentals
in the electrical potential as with a thermocouple, or optical changes as with an infrared
thermometer. For remote measurements, the thermocouple and the infrared systems are
the preferred means to measure temperatures especially when testing is conducted.
Systems and Processes
e earlier denitions give the properties of a system. ese are the volume, pressure,
and temperature. If any of the properties of the system change, we state that the sys-
tem has undergone a process. If the pressure of a system does not change, the system
is isobaric. If the volume of the system does not change, the system is isometr ...