Abstract ：

PVT properties and the thermal-pressure coefficient, gamma V = (partial derivative(P)/partial derivative(T))(V), of 2-propanol have been simultaneously measured in the near- and supercritical regions using hightemperature and high-pressure nearly constant-volume piezo-calorimeter. Measurements were made along 9 liquid and 3 vapor isochores between (234.3 and 697.69) kg center dot m(-3) and at temperatures from (317.17 to 522.36) K at pressures up to 6.05 MPa. For each measured isochore (rho), the values of phase transition temperature (T-S) and pressure (P-S) at the liquid-gas phase equilibrium curve have been determined using the isochoric P - T break point and thermal-pressure coefficient abruptness techniques. The measured saturated liquid (rho(S)') and vapor (rho(S)'') densities near the critical point and thermal-pressure coefficient abruptness disappearance were used to estimate the values of the critical parameters (T-C = 508.72 K, P C = 4.840 MPa, and rho(C) = 268.82 kg center dot m(-3)) of 2-propanol. The expanded uncertainty of the pressure (P), density (rho), and thermal-pressure coefficient (gamma(V)) measurements at the 95 % confidence level with a coverage factor of k = 2 are estimated to be 0.05 %, 0.16 %, and 1.5 %, respectively. Scaling-type critical anomaly of the asymptotic behavior of thermal-pressure coefficient in the immediate vicinity of the critical point was experimentally observed. The measured pressures (PVT) and thermal-pressure coefficients (gamma(V) VT) have been used to calculate of the other key thermodynamic properties such as internal pressure (P int), enthalpy (Delta H-vap) and entropy (.S vap) of vaporization, saturation (C-sat), isobaric (C-P), and isochoric (C-V) heat capacities.

Keyword ：

2-Propanol Critical point Density Heat capacity Internal pressure Thermal-pressure coefficient

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Abstract ：

The values of pressure (P), the temperature derivative, gamma(v) = (partial derivative P/partial derivative T)(v), and the density (rho) of benzene have been simultaneously measured in the near- and supercritical regions using high-temperature and high-pressure piezo-calorimeter. Measurements were made along 10 liquid and vapor isochores between (265.5 and 653.9) kg.m(-3) and at temperatures from (346.03 to 615.92) K and at pressures up to 9.171 MPa. For each isochore most measurements were made in the immediate vicinity of the liquid-gas phase transition temperature (single- and two-phase regions) where the break of the P-T isochores and the jumps of the thermal-pressure coefficient gamma(v) are observing. Temperatures and pressures (T-s, P-s) at the liquid-gas phase transition curve for each constant density (isochore, rho) and the critical parameters (T-C,P-C,rho(C)) for benzene were measured using the isochoric P - T break point and thermal -pressure coefficient jump techniques. The expanded uncertainty of the pressure (P), density (rho), and thermal -pressure coefficient (gamma(v)) measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be, 0.16%, 0.05% and (0.12 to 1.5) % (depending on temperature and pressure), respectively. The measured pressures (PVT) and thermal -pressure coefficients (gamma vVT) have been used to calculate of the internal pressure (or energy-volume coefficient) as (partial derivative U/partial derivative V)(T) = T(partial derivative P/partial derivative T)(v) -P. We have also measured the temperature derivatives of the internal energy (partial derivative U/partial derivative V)(v) = C-v (isochoric heat capacity) using the same piezocalorimetric cell. The effect of pressure and temperature on the internal pressure was studied. isochoric P-T curve break point and isochoric thermal-pressure coefficient jump techniques were used to accurately determine of the phase transition and critical points parameters. The measured values of the thermal-pressure coefficient were interpreted in term of scaling theory of critical phenomena. The measured values of pressure (P), temperature derivative, (partial derivative P/partial derivative T)(v), temperature and density at the saturation curve together with our previous isochoric heat capacity measurements were used to calculate other thermodynamic properties of benzene at saturation curve. (C) 2019 Elsevier B.V. All rights reserved.

Keyword ：

Benzene Critical point Density Heat capacity Internal pressure Thermal-pressure coefficient

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A new portable absolute Transient Hot-Wire instrument for measuring the thermal conductivity of solids over a range of 0.2 to is presented. The new instrument is characterized by three novelties: (a) an innovative two-wires sensor which provides robustness and portability, while at the same time employs a soft silicone layer to eliminate the effect of the contact resistance between the wires and the sample, (b) a newly designed compact portable printed electronic board employing an FPGA architecture CPU to the control output voltage and data processing-the new board replaces the traditional, large in size Wheatstone-type bridge system required to perform the experimental measurements, and (c) a cutting-edge software suite, developed for the mesh describing the structure of the sensor, and utilizing the Finite Elements Method to model the heat flow. The estimation of thermal conductivity is modeled as a minimization problem and is solved using Bayesian Optimization. Our revolutionizing proposed methodology exhibits radical speedups of up to 120, compared to previous approaches, and considerably reduces the number of simulations performed, achieving convergence only in a few minutes. The new instrument was successfully employed to measure, at room temperature, the thermal conductivity of two thermal conductivity reference materials, Pyroceram 9606 and Pyrex 7740, and two possible candidate glassy solids, PMMA and BK7, with an absolute low uncertainty of 2 %.

Keyword ：

Bayesian optimization Finite element method Low uncertainty Solids Thermal conductivity Transient hot-wire

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One-phase liquid and two-phase liquid + vapour equilibrium, isochoric heat capacities (CV) and densities (rho(s)) were measured for ionic liquid (IL) 1-hexyl-3-methylimidazolium bis[(trifluoromethyl) sulfonyl] imide ([ C(6)mim][ NTf2]). Measurements were concentrated near the liquid-gas phase transition curve in order to closely observe the changes. The measurements have been made over the temperature range from (330 to 480) K and pressures up to 20 MPa using a high-temperature, high-pressure, nearly constant volume adiabatic calorimeter. The values of temperature at the liquid-gas phase transition curve for each measured isochore (phase transition parameters, rho(S); T-S) were obtained by analysis of the quasistatic thermograms (readings of PRT, T-tau plot) and barograms (readings of the pressure transducer, P-t plot). The combined expanded uncertainty of the density, rho, and isochoric heat capacity, CV, measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be 0.06% and 2.0%, respectively.

Keyword ：

coexistence curve density ionic liquid isochoric heat capacity saturated density

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This article describes a 10-year cooperative effort between the U.S. National Institute of Standards and Technology (NIST) and five major journals in the field of thermophysical and thermochemical properties to improve the quality of published reports of experimental data. The journals are Journal of Chemical and Engineering Data, The Journal of Chemical Thermodynamics, Fluid Phase Equilibria, Thermochimica Acta, and International Journal of Thermophysics. The history of this unique cooperation is outlined, together with an overview of software tools and procedures that have been developed and implemented to aid authors, editors, and reviewers at all stages of the publication process, including experiment planning. Both successes and failures are highlighted. The procedures are now well established and are designed to yield maximum benefit to all stakeholders (authors, editors, reviewers, publishers, readers, data users, etc.) through the establishment of procedures and support tools that efficiently serve the specific interests of those involved. All specially designed tools and procedures are described fully, together with their benefits and examples of application. A key feature of the cooperation is the efficient validation of experimental data after peer review but before acceptance for publication. Nearly 1000 articles per year are considered within the scope of this work, with significant problems identified in roughly one-third of these. Full statistics for the findings are given, and a variety of examples of common problems found are given.

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The available experimental data for the density and viscosity of liquid antimony, bismuth, lead, nickel and silver have been critically examined with the intention of establishing a density and a viscosity standard. All experimental data have been categorized into primary and secondary data according to the quality of measurement specified by a series of criteria. The proposed standard reference correlations for the density of liquid antimony, bismuth, lead, nickel and silver are respectively characterized by standard deviations of 0.8, 0.6, 0.9, 1.7 and 0.9% at the 95% confidence level. The standard reference correlations for the viscosity of liquid antimony, bismuth, lead, nickel and silver are characterized by standard deviations of 8.3, 12.0, 4.8, 14.6, and 3.8% at the 95% confidence level respectively.

Keyword ：

Antimony bismuth density lead melt nickel reference data silver viscosity

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The available experimental data for the density and viscosity of liquid cadmium, cobalt, gallium, indium, mercury, silicon, thallium, and zinc have been critically examined with the intention of establishing both a density and a viscosity standard. All experimental data have been categorized into primary and secondary data according to the quality of measurement, the technique employed and the presentation of the data, as specified by a series of criteria. The proposed standard reference correlations for the density of liquid cadmium, cobalt, gallium, indium, silicon, thallium, and zinc are characterized by percent deviations at the 95% confidence level of 0.6, 2.1, 0.4, 0.5, 2.2, 0.9, and 0.7, respectively. In the case of mercury, since density reference values already exist, no further work was carried out. The standard reference correlations for the viscosity of liquid cadmium, cobalt, gallium, indium, mercury, silicon, thallium, and zinc are characterized by percent deviations at the 95% confidence level of 9.4, 14.0, 13.5, 2.1, 7.3, 15.7, 5.1, and 9.3, respectively. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729873]

Keyword ：

cadmium cobalt density gallium indium melt mercury reference data silicon thallium tin viscosity zinc

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In this paper, the available experimental data for the density and viscosity of eutectic liquid alloys Al+Si, Pb+Bi, and Pb+Sn have been critically examined with the intention of establishing a reference standard representation of both density and viscosity. All experimental data have been categorized as primary or secondary according to the quality of measurement, the technique employed, and the presentation of the data, as specified by a series of carefully defined criteria. The proposed standard reference correlations for the density of liquid Al+Si, Pb+Bi, and Pb+Sn are, respectively, characterized by deviations of 2.0%, 2.9%, and 0.5% at the 95% confidence level. The standard reference correlations for the viscosity of liquid Al+Si, Pb+Bi, and Pb+Sn are, respectively, characterized by deviations of 7.7%, 14.2%, and 12.4% at the 95% confidence level. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4750035]

Keyword ：

bismuth density eutectic lead metal reference correlations tin viscosity

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The available experimental data for the density and viscosity of liquid copper and tin have been critically examined with the intention of establishing a density and a viscosity standard. All experimental data have been categorized into primary and secondary data according to the quality of measurement specified by a series of criteria. The proposed standard reference correlations for the density of copper and tin are characterized by standard deviations of 1.3% and 1.0% at the 95% confidence level, respectively. The standard reference correlations for the viscosity of copper and tin are characterized by standard deviations of 6.3% and 20% at the 95% confidence level, respectively. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3467496]

Keyword ：

copper density melt reference data tin viscosity

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