An alcohol thermometer is a device used to measure temperature, utilizing alcohol as the thermometric fluid. Unlike mercury thermometers, which can be hazardous, alcohol thermometers are safer and often used in household settings. The alcohol expands and contracts with temperature changes, allowing for accurate readings on a calibrated scale. These thermometers are commonly made of glass and can measure a range of temperatures. They are particularly useful in applications where lower temperatures need to be measured, such as in weather stations or laboratories. The use of colored alcohol also makes it easier to read the measurements.