Thermometer Site

These use liquid crystals that change color to indicate temperature, often placed on the forehead, though they are generally less accurate than digital models.

All thermometers operate based on specific physical changes that occur when heat increases or decreases: thermometer

Digital thermometers use an electronic device known as a thermistor. A thermistor’s electrical resistance changes based on temperature, and this change is measured to compute a precise numerical value. These use liquid crystals that change color to

When measuring body temperature, the accuracy of a digital thermometer depends on its application, notes the Mayo Clinic : When measuring body temperature, the accuracy of a

These scan the temple to detect the temperature of the temporal artery. They are non-invasive and excellent for screening, though they may require more precise reading with a traditional thermometer if a high fever is suspected.

Traditional bulb thermometers rely on the expansion and contraction of liquids (like alcohol or historically mercury) as temperatures fluctuate. As the temperature increases, the liquid expands and moves up the narrow, calibrated glass tube.