Question

The digital thermometer do not use

Answer 1

Digital thermometer differs from traditional thermometer by containing a sensor and an electrode attached to it. Its working principle is that changes in temperature lead to a change in resistance of a sensor, allowing a computer to convert the difference to a digital readout. The sensor is a thermo resistor or thermistor. Thermistor provides good accuracy and high sensitivity.

Complete step-by-step solution:
Digital thermometers are temperature sensing devices which contain the combination of a thermocouple, a battery-powered, dual slope digital voltmeter to measure the output of the thermocouple, and an electronic display.
Unlike traditional thermometers, digital thermometers do not use mercury. Mercury thermometers work on the principle that a rise in temperature can cause the mercury to expand, which can be used to measure the temperature of the body.
Digital thermometers give numerical reading on a digital display, usually to one decimal place. This makes them even more precise compared to other thermometer types.
Digital thermometers are also safer than mercury thermometers. Mercury is a toxic chemical to the human body as well as the surrounding environment. It is usually enclosed within the fragile glass bulb of the thermometer. But digital thermometers use metal components which contain no harmful chemicals to ensure safety.

Note: Thermistors used in digital thermometers are also used in a variety of electronic devices where changes in temperature have to be taken into account. They act as circuit breakers or fuses to shut down temperature-sensitive electronics and prevent overheating damage. They are also used in heating and air conditioning thermostats.