thermometers

Thermometers are devices used to measure temperature, indicating how hot or cold something is. They work by detecting changes in physical properties that vary with temperature, such as the expansion of liquids (like mercury or alcohol in traditional thermometers), electrical resistance (as in digital thermometers), or infrared radiation (used in non-contact thermometers). When exposed to heat, these properties change predictably, allowing the device to provide a numerical temperature reading. Thermometers are essential tools in healthcare, cooking, weather forecasting, and scientific research, helping us understand and monitor temperature accurately in various contexts.