When measuring body temperature, the accuracy of a digital thermometer depends on its application, notes the Mayo Clinic :
These use liquid crystals that change color to indicate temperature, often placed on the forehead, though they are generally less accurate than digital models. thermometer
Over the next century, researchers refined this concept, shifting to liquids like wine, and eventually, alcohol and mercury. In 1714, Daniel Gabriel Fahrenheit developed the first true mercury-in-glass thermometer, providing a consistent, predictable tool with a standardized scale. The Celsius scale, or centigrade, was developed shortly after, basing measurements on the freezing ( ) and boiling points ( ) of water. How Thermometers Work When measuring body temperature, the accuracy of a
The invention of the thermometer is widely credited to Italian mathematician and physicist Galileo Galilei around 1592, who created a crude water thermometer that measured temperature changes through the expansion or contraction of air. This early instrument was also sensitive to air pressure, making it part-barometer. The Celsius scale, or centigrade, was developed shortly
All thermometers operate based on specific physical changes that occur when heat increases or decreases:
Common for environmental or laboratory use, these are rarely used in medical settings today due to the risks associated with broken glass and toxic liquids. Key Uses and Applications Thermometers are crucial in numerous fields:
Generally considered the most accurate method for infants.