An alcohol thermometer is a device used to measure temperature, utilizing alcohol as the liquid inside a glass tube. Unlike mercury thermometers, alcohol thermometers are safer and more environmentally friendly, as alcohol is less toxic. The alcohol expands and contracts with temperature changes, allowing for accurate readings. These thermometers are commonly used in various applications, including laboratories, weather stations, and home use. They typically have a scale marked in degrees Celsius or Fahrenheit, making them easy to read. Alcohol thermometers are particularly useful in colder climates, as they can measure lower temperatures without freezing.