WebFeb 10, 2024 · How does a thermometer work? Thermometers are instruments that measure temperature. When the tip of the thermometer touches the material it is measuring, heat energy travels through it and into the mercury contained inside. This causes the mercury to expand and turn into a liquid, driving it up the tube within the thermometer. WebJun 10, 2024 · How it works is that it sends a small current or voltage to its sensor and then measures it across the sensor. In order to minimize the errors in this thermometer, a 4-wire connection is often used. Two wires in this system measure the voltage or current across the sensor and two wires are responsible for carrying the excitation.

Mercury Thermometers US EPA

WebAll thermometers work according to the same basic principle: objects expand when heated and contract when cooled. Bulb thermometers The most common thermometer is the bulb thermometer, which comprises a large bulb filled with a liquid and a narrow glass tube through which the liquid rises. WebHow Does A Thermometer Work? - Kids Video Show Kids Video Show 25.8K subscribers Subscribe 58K views 6 years ago In this kids educational videos, we are going to see how does a thermometer... mylearn ed

How Does the Thermometer Work? - Monroe Career

WebHow a digital thermometer works There are various different kinds of modern digital thermometer sensors, among the most common of which is a type called a ‘resistance temperature detector’ (RTD). This sort of thermometer works on the principle that the electrical resistance of metal changes with temperature. An electronic thermometer works by putting a voltage across its metal probe and measuring how much current flows through it. If you put the probe in boiling water, the water's heat makes electricity flow through the probe less easily so the resistance goes up by a precisely measurable amount. See more Not all thermometers work this way, however. The one shown in ourtop photo has a metal pointer that moves up and down a circularscale. Open up one of these thermometers … See more One problem with mercury and dial thermometers is that they take awhile to react to temperature changes. Electronicthermometers don't have that problem: you simply … See more If you want to measure something that's too hot or cold for a conventional thermometer tohandle, you'll need a thermocouple: a … See more mylearn dundee