The liquid in a glass thermometer, either colored alcohol or mercury, expands as it heats and condenses as it cools. In a thermometer, the liquid cannot expand outward and the only place it can go is up or down. Temperature on a glass thermometer can be measured in Fahrenheit, Celsius or Kelvin.Continue Reading
Once a thermometer is built and filled with liquid, numbers are printed, usually along the outside. These numbers make it easy to determine the temperature of a person, home or even the outdoors.
Thermometers that do not use liquid use a spring mechanism that expands as it heats and contracts as it cools.Learn more about Thermodynamics
The red liquid inside of a thermometer is alcohol. When the temperature changes, the alcohol expands, providing a reading based on the thermometer's scale. Red dye is used to color the clear alcohol so that someone is able to easily read the thermometer.Full Answer >
After removing the cover plate, if a clear glass ampoule with a silver liquid inside is visible in a thermostat, the unit contains mercury. If it is a new thermostat still in the packaging, look for the chemical sign for mercury, which is "Hg," on the container.Full Answer >
A thermometer is usually calibrated using two approaches: the ice point method and the boiling point method. This temperature measuring deviceÂ must be calibrated daily if repeatedly used. Otherwise, a thermometerÂ should be adjusted prior to itsÂ initial usage, when switching from one temperature to another or every time itÂ is dropped.Full Answer >
A clinical thermometer is a thermometer that has been designed to measure the human body's temperature; they are designed to detect temperatures a few degrees above and below the average human temperature (97.7 to 99.5 degrees Fahrenheit). Historically, clinical thermometers were generally mercury-filled, but modern thermometers are often digital.Full Answer >