International Temperature Scale ITS

The International Temperature Scale — ITS-90 For ITS-90, temperatures of a series of fixed points are measured as accurately as possible with a gas thermometer. A complete description of ITS-90 is given in the literature5 7 and... 

Table A2.1 Fixed points for the International Temperature Scale, ITS-90...

The XVIII Conference Generale des Poids et Mesures adopts the version of the International Temperature Scale ITS-90 The ITS-90 provides die best to-date practical approximation of die thermodynamic scale and offers a reproducibility that is better than the thermodynamic scale. 

International Titanium Association, The (ITA), safety committee of, 24 865 International Technical Roadmap for Semiconductors (ITRS), 75 181 International temperature scales (ITS), 75 749 24 436... 

The International Temperature Scale (ITS) revised in 1990 establishes fixed points and the corresponding temperatures. A few of them are reported in Table 6.2. 

International Temperature Scale (ITS-90) - The official international temperature scale adopted in 1990. It consists of a set of fixed points and equations which enable the thermodynamic temperature to be determined from operational measurements. [9]... 

The majority of pulse calorimetric measurements use pyrometry, which is non-contact (optical) measurement of the thermal radiation emitted fi om any heated body or substance according to Planck s radiation law for black body radiation. Planck s law describes the spectral distribution of black body radiance which provides the basis for the International Temperature Scale (ITS-90) [76], especially above the freezing point of silver [77]. Because Planck s law is only... 

If there is a broad melting range, it is better characterized by the melting peak temperature, Tp. It represents the temperature of the largest melting rate. The temperature of the recovery of the baseline T is a function of the design of the calorimeter. In Fig. 4.63 several reference materials are listed that may be used for temperature calibration to an accuracy of 0.1 K or better and for establishment of a link to the International Temperature Scale (ITS, see Appendix 8). 

Another important projection of the PvT-diagram is the PT-graph (see Figure 2.5). In this projection, the dew-point line coincides with the boiling point in the vapor pressure curve. Similarly, solidus and liquidus curve coincide in the melting curve. The phase transition between the solid state and the gaseous state is described by the sublimation curve. Vapor pressure curve, melting curve, and sublimation curve meet at the triple point, where the three phases vapor, liquid, and solid coexist in equilibrium. The triple point of water is very well known and can be reproduced in a so-called triple point cell. It is used as a fix point of the International Temperature Scale ITS-90 [4] (Tt, = 273.16 K or = 0.01"C, Ptr = 611.657 0.01 Pa). The vapor pressure curve ends at the critical point no liquid exists above the critical temperature T. ... 

---