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The equations are to be used to calculate the density of water, in the temperature range 5 to 40 °C on ITS-90, used in the gravimetric determina- tion of the volume of volumetric standards. Key words: air-saturated water; calibra- tion; density of water; isothermal compressibility; ITS-90; volumetric standards. Accepted: April 27,1992. 1.
Tablesareprovidedforthedensity,enthalpy,entropy,andvolumeofwaterand steam calculated from the lAPWS Formulation1995 forthe Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use.This
Saturation Properties of Ordinary Water Substance [7] containing a set of simple equations which yield values for the vapor pressure as well as the density, specific enthalpy and specific entropy of the saturated vapor and liquid. The values calculated from these equations are not identical with the corresponding values derived from Eq.
as an analytic function Qf temperature and. density. This fundamental equation is a dimen sionless version of the Provisional lAPS Formulation 1982 for the Thermodynamic Prop erties of Ordinary Water Substance for Scientific and General Use, which enables one to .
21 gru 2018 · The formulation (commonly referred to as IAPWS-95) is for the Helmholtz energy as a function of temperature and density; appropriate combinations of derivatives can produce any thermodynamic property desired (pressure, sound speed, heat capacity, enthalpy, entropy, etc.).
The chemical formula of water is H 2O. Its molecu-lar structure is roughly as shown below: The density of water, at standard temperature and pressure is, by definition ρ = 1 gm ⁄ cm3 = 103 kg ⁄ m3. Since the molecular weight of water (ignoring isotopes like 18O and 2H) is 18, the number density of molecules in liquid water is n = NA 18 ≈ ...
Simple but highly accurate correlations have been developed for the thermodynamic properties including density, heat capacity, and speed of sound , viscosity, thermal con-ductivity, and static dielectric constant of liquid water as a function of temperature at a pressure of 0.1 MPa.
