Final answer:
The statement is true; pressure switches detect improper pressures in combustion chambers, and a manometer measures pressure using mercury. 1 atm equals 760 torr.
Step-by-step explanation:
The statement that a pressure switch is designed to detect improper pressures in the combustion chamber is True. Pressure switches are safety devices installed in various systems to monitor and control the pressure levels. In the context of a combustion chamber, if the pressure is too high or too low, it can indicate a malfunction, which may lead to unsafe operating conditions.
Regarding instruments that measure gas pressure, the device that measures pressure by the height of a column of mercury is known as a manometer. In terms of pressure measurements, 1 atmosphere (atm) is equivalent to 760 torr.