What type of temperature gauge is constructed of two dissimilar metal strips?

The bimetallic temperature gauge is constructed from two strips of different metals that have different coefficients of thermal expansion. When the temperature changes, these metals expand at different rates, which causes the strips to bend. This bending motion is then translated into a mechanical movement that moves the needle of the gauge, indicating the temperature on a calibrated dial.

This type of gauge is commonly used for measuring temperatures in various applications due to its simplicity and durability. It does not require any external power source and provides a direct visual reading, making it advantageous in many industrial settings.

The other options are various types of temperature measuring devices but operate on different principles. The infrared temperature sensor measures the infrared radiation emitted by objects, thermocouples generate a voltage based on the temperature difference between two junctions of dissimilar metals, and resistance temperature detectors (RTDs) measure temperature by correlating the electrical resistance of the material to temperature changes. Each of these methods leverages specific physical laws and material properties that distinguish them from the bimetallic temperature gauge’s design and functionality.