lämpömittarien

Lämpömittari is the Finnish word for thermometer. A thermometer is an instrument for measuring temperature. It typically functions by exploiting the physical property of a substance that changes predictably with temperature.

Early thermometers often used the expansion and contraction of liquids, such as mercury or alcohol, within a sealed glass tube. As temperature increases, the liquid expands and rises in the tube, indicating a higher temperature. Conversely, a decrease in temperature causes the liquid to contract and fall.

Modern thermometers utilize a variety of principles. Digital thermometers often use thermistors or thermocouples, which are electronic components whose electrical resistance or voltage changes with temperature. Infrared thermometers measure the thermal radiation emitted by an object, allowing for non-contact temperature measurement.

Thermometers are used in numerous applications, including weather forecasting, medical diagnosis, industrial processes, and scientific research. The choice of thermometer depends on the required accuracy, the temperature range to be measured, and the specific application. Common temperature scales used with thermometers include Celsius, Fahrenheit, and Kelvin. The development of accurate and reliable thermometers has been crucial for scientific advancement and everyday life.