Mercury-in-glass thermometer ushered in a new era of accuracy and precision in thermometry, and is still to this day regarded as one of the most accurate thermometers available. The thermometer was used by the originators of the Fahrenheit and Celsius scales. Anders Celsius, a Swedish scientist, devised the Celsius scale, which was described in his publication "The origin of the Celsius temperature scale" in 1742. Celsius used two fixed points in his scale: the temperature of melting ice and the temperature of boiling water. This wasn't a new idea, since Isaac Newton was already working on something similar. The distinction of Celsius
Planck temperature its temperature. If an object were to reach the temperature of ("T"), the radiation it would emit would have a wavelength of (Planck length), at which point quantum gravitational effects become relevant. At temperatures greater than or equal to "T", current physical theory breaks down because we lack a theory of quantum gravity. Planck temperature Planck temperature, denoted by "T", is the unit of temperature in the system of natural units known as Planck units. It serves as the defining unit of the Planck temperature scale. In this scale the magnitude of the Planck temperature is equal to 1, while