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The higher proportion of down to feather makes this a lighter quilt, offering the advantage of warmth without weight.ĭown gives a quilt more loft. Filled with a minimum of 80% white duck down and 20% white duck feather, this Morgan & Finch Quilt is luxuriously soft, ultra-light and fluffy. Δ – (G o T – H o 298.15)/T = – (G o T – H o 298.15)/T (gas) – – (G o T – H o 298.Sleep blissfully with the Platinum Duck Quilt. – (G o T – H o 0)/T = R ln(Q) + K4 ln(A r) 2 ln(T) + K6 J mol –1 K –1 = S o – (H o T o 0)/T J mol –1 K –1 S 0, the Sackur-Tetrode constant, is derived from: S 0 = R, where the numerical value in the equation is equal to (2π/1000) 3/2/10 5 Partition Functions Second radiation constant, c 2 = 0.014387752 ± 0.000000025 m K (metre Kelvin)Įnergy level = ν i cm –1 Quantum number of energy level, J i
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All values given correspond to the 2002 CODATA fundamental constants (6) and to a standard state pressure of one bar. The thermodynamic properties of platinum gas given in Table IIB were calculated using the method of Kolsky, Gilmer and Gilles (18) outlined below. NBP: normal boiling point at a pressure of one atmosphere (1.01325 bar)Ĭalculation of the Thermodynamic Properties of an Ideal Monatomic Gas On average these latter two sets of results show satisfactory agreement with values selected here. The two most recent sets of measurements: by Hixson and Winkler ( 12) (at 2041–5100 K) lead to a specific heat of 41.35 J mol –1 K –1 and a heat of fusion of 24.2 kJ mol –1, and the measurements of Wilthan and colleagues ( 5, 6) (at 2045–2830 K) lead to a specific heat of 36.5 J mol –1 K –1 and a heat of fusion of 21.8 kJ mol –1.
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Other measurements made on platinum in the liquid region used the rapid pulse heating technique, but the different values obtained show marked differences, and currently this method does not appear to be as accurate as the levitation calorimetry method used by Bonnell.įor instance, Gather, Shaner and Hodgson ( 10) (at 2041–8000 K) obtained a value for the specific heat of 49 J mol –1 K –1 and for the heat of fusion of 27 ± 6 kJ mol –1, while Lebedev, Savvatimskii and Smirnov ( 11) obtained a heat of fusion of 25 kJ mol –1. The difference between the above three values and those tabulated for the liquid phase in Table IIA is due to the values in the Table being taken beyond their true accuracy for interpolation purposes. These measurements can then be represented by the following equation which has an overall accuracy of 1.2%, equivalent to a standard deviation of ± 1190 J mol –1: Therefore, in now selecting the values given in Bonnell's thesis, his temperature values in the range 2205 to 2650 K are accepted for this review while his enthalpy values have been adjusted by 195.08/195.09 to ensure that the atomic weight is the same as that used previously for the solid phase ( 2). The values given in the paper published two years earlier were only preliminary and should not have been given the attention they received. In fact, the thesis contains the fully corrected values. However, private communication with Bonnell has indicated that this was not the case.
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thesis was published two years later ( 9) and it was assumed that this was because he was completing work on other metals and that, as is the usual practice, the values in the earlier paper were definitive. ( 8) which were supposedly the measurements made by David Bonnell who was working on his Ph.D. However, selected values used in that paper, in the liquid region, were based on the enthalpy values of Chaudhuri et al. In 1994, when the original paper was published ( 2), the melting point of platinum, 2041.3 K, was only tentatively assigned to the ITS-90 temperature scale. High Temperature Data of Platinum in the Gaseous Phase (gas, 1 bar pressure) T, K High Temperature Data of Platinum in the Condensed Phase (solid, liquid) T, K