ITS90lämpötila

ITS90lämpötila, also known as International Temperature Scale of 1990 (ITS-90), is a standard temperature scale defined by the International Bureau of Weights and Measures (BIPM). It is widely used for scientific and industrial purposes, providing a consistent and reproducible reference for temperature measurements.

The ITS-90 scale is based on the triple point of water, which is the unique combination of temperature and pressure at which water, ice, and water vapor coexist in equilibrium. This point is defined as exactly 273.16 Kelvin (0.01 degree Celsius) and is used as the fixed reference point for the scale.

The scale is divided into two main ranges: the ice point range (from 0.01 K to 103.125 K) and the steam point range (from 103.125 K to 1357.77 K). The ice point range is defined by the melting pressure of ice, while the steam point range is defined by the saturation pressure of water vapor.

ITS90lämpötila is a practical temperature scale that is easy to use and provides high accuracy. It is widely accepted and used in various fields such as metrology, thermometry, and industrial applications. The scale is regularly updated and maintained by the BIPM to ensure its accuracy and reliability.

The ITS-90 scale is an essential tool for scientists and engineers, providing a consistent and reproducible reference for temperature measurements. It is used in a wide range of applications, from fundamental research to industrial processes, ensuring accurate and reliable temperature control.