What type of sensor measures the physical quantity of temperature?

A temperature sensor is specifically designed to measure the physical quantity of temperature. These sensors work on different principles depending on their type, such as thermocouples, thermistors, and resistance temperature detectors (RTDs). Each of these sensors converts temperature into a measurable electrical signal, enabling accurate readings of thermal conditions.

In understanding why the other options do not accurately answer the question: a pressure sensor is used for measuring pressure within liquids or gases, a flow rate sensor measures the volume or mass of a fluid that passes through a given point in a certain period, and a level sensor determines the level of a substance, usually in a container or tank. None of these sensors are intended to measure temperature, which solidifies the distinction and the correctness of the choice of a temperature sensor.