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**IAPWS95**: Thermophysical Properties of Water and Steam**dpdTTD**: Pressure Derivative with Respect to Temperature, Function of...

# Pressure Derivative with Respect to Temperature, Function of Temperature and Density

### Description

The function `dpdTTD(T,D)`

returns the pressure derivative with
respect to Temperature, dpdT, for given T [K] and D [kg/m3]

### Usage

1 |

### Arguments

`T` |
Temperature [ K ] |

`D` |
Density [ kg m-3 ] |

### Details

This function calls a Fortran DLL that solves the Helmholtz Energy Equation. in accordance with the Revised Release on the IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use (June 2014) developed by the International Association for the Properties of Water and Steam, http://www.iapws.org/relguide/IAPWS-95.html. It is valid from the triple point to the pressure of 1000 MPa and temperature of 1273.

### Value

The pressure derivative with respect to T: dp/dT [ MPa K-1 ] and an Error Message (if an error occur: errorCodes)

### Examples

1 2 3 |

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- BT: Second Virial Coefficient (B), Function of Temperature
- CndTD: Thermal Conductivity, Function of Temperature and Density
- CpfT: Specific Isobaric Heat Capacity of Fluid Phase, Function of...
- CpgT: Specific Isobaric Heat Capacity of Gas Phase, Function of...
- CpTD: Specific Isobaric Heat Capacity, Function of Temperature and...
- CpTp: Specific Isobaric Heat Capacity, Function of Temperature and...
- CT: Third Virial Coefficient (C), Function of Temperature
- CvfT: Specific Isochoric Heat Capacity of Fluid Phase, Function of...
- CvgT: Specific Isochoric Heat Capacity of Gas Phase, Function of...
- CvTD: Specific Isochoric Heat Capacity, Function of Temperature and...
- CvTp: Specific Isochoric Heat Capacity, Function of Temperature and...
- DCrit: Water Critical Density
- dDdTTD: Density Derivative with respect to Temperature, Function of...
- dDdTTp: Density Derivative with respect to Temperature, Function of...
- Dfp: Saturated Liquid Density, Funtion of Pressure
- Dfs: Saturated Liquid Density, Function of Entropy
- DfT: Saturated Liquid Density, Function of Temperature
- DfTr: Liquid Water Density at Triple Point
- Dgp: Saturated Gas Density, Funtion of Pressure
- Dgs: Saturated Gas Density, Function of Entropy
- DgT: Saturated Gas Density, Function of Temperature
- DgTr: Water Gas Density at Triple Point
- Dhs: Density, Function of Enthalpy and Entropy
- dpdDTD: Pressure Derivative with respect to Density, Function of...
- dpdDTp: Pressure Derivative with respect to Density, Function of...
- dpdTTD: Pressure Derivative with Respect to Temperature, Function of...
- dpdTTp: Pressure Derivative with respect to Temperature, Function of...
- Dph: Density, Function of Pressure and Enthalpy
- Dps: Density, Function of Pressure and Entropy
- DpTcteTab: Table of Densities, Function of Pressure for a Fixed...
- DTh: Density, Function of Temperature and Enthalpy
- DTp: Density, Function of Temperature and Pressure
- DTpcteTab: Table of Densities, Function of Temperature for Fixed...
- DTs: Density, Function of Temperature and Entropy
- errorCodes: Error Codes
- fTD: Helmholtz Free Energy, Function of Temperature and Density
- fTp: Helmholtz Free Energy, Function of Temperature and Pressure
- FugaTp: Fugacity, Function of Temperature and Pressure
- GibbsTp: Specific Gibbs Energy, Function of Temperature and Pressure
- hCrit: Water Critical Enthalpy
- hfT: Saturated Liquid Enthalpy, Function of Temperature
- hgT: Saturated Gas Enthalpy, Function of Temperature
- hps: Enthalpy, Function of Pressure and Entropy
- hpTcteTab: Table of Enthalpies, Function of Pressure for Fixed...
- hTD: Specific Enthalpy, Function of Temperature and Density
- hTp: Specific Enthalpy, Function of Temperature and Pressure
- hTpcteTab: Table of Enthalpies, Function of Temperature and Fixed...
- JTcTD: Joule-Thomson Coefficient, Function of Temperature and...
- KapaTD: Isothermal Compressibility, Function of Temperature and...
- KViscTD: Kinematic Viscosity, Function of Temperature and Density
- pCrit: Water Critical Pressure
- phi0: Ideal-Gas part of the Dimensionless Helmholtz Energy...
- phi0D: First Derivative of the Ideal-Gas part of the Dimensionless...
- phi0DD: Second Derivative of the Ideal-Gas Part of the Dimensionless...
- phi0DT: Second Derivative of the Ideal-Gas Part of the Dimensionless...
- phi0T: First Derivative of the Ideal-Gas Part of the Dimensionless...
- phi0TT: Second Derivative of the Ideal-Gas Part of the Dimensionless...
- phir: Residual-Gas Part of the Dimensionless Helmholtz Energy...
- phirD: First Derivative of the Residual-Gas part of the...
- phirDD: Second Derivative of the Residual-Gas Part of the...
- phirDT: Second Derivative of the Residual-Gas Part of the...
- phirT: First Derivative of the Residual-Gas Part of the...
- phirTT: Second Derivative of the Residual-Gas Part of the...
- pMeltT: Melting Pressure, Function of Temperature
- PrandtTD: Prandt Number, Function of Temperature and Density
- pSatD: Saturation Pressure, Function of Density
- pSats: Saturation Pressure, Function of Entropy
- pSatT: Saturation Pressure, Function of Temperature
- pTD: Pressure, Function of Temperature and Density
- pTr: Water Pressure at Triple Point
- Rwater: Water Specific Gas Constant
- satTabhT: Table of Saturation Liquid Phase Enthalpies, Function of...
- satTabp: Table of Saturation Densities, Enthalpies and Entropies,...
- satTabpT: Table of Saturation Pressures, Function of Temperature
- satTabT: Table of Saturation Densities, Enthalpies and Entropies,...
- satTabTp: Table of Saturation Temperatures, Function of Pressure
- satTabvp: Table of Saturation Volumes, Enthalpies and Entropies,...
- satTabvT: Table of Saturation Volumes, Enthalpies and Entropies,...
- sCrit: Water Critical Entropy
- sfT: Saturated Liquid Entropy, Function of Temperature
- sfTr: Liquid Water Entropy at Triple Point
- sgT: Saturated Gas Entropy, Function of Temperature
- sgTr: Water Gas Entropy at Triple Point
- SigmaT: Surface Tension, Function of Temperature
- sph: Entropy, Function of Pressure and Enthalpy
- spTcteTab: Table of Entropies, Function of Pressure for Fixed...
- sTD: Specific Entropy, Function of Temperature and Density
- sTp: Specific Entropy, Function of Temperature and Pressure
- sTpcteTab: Table of Entropies, Function of Temperature for a Fixed...
- TCrit: Water Critical Temperature
- TDh: Temperature, Function of Density and Enthalpy
- TDp: Temperature, Function of Density and Pressure
- TDs: Temperature, Function of Density and Entropy
- ThrcTD: Isothermal Throttling Coefficient, Function of Tenoerature...
- Ths: Temperature, Function of Enthalpy and Entropy
- Tph: Temperature, Function of Pressure and Enthalpy
- Tps: Temperature, Function of Pressure and Entropy
- TSatD: Saturation Temperature, Function of Density
- TSatp: Saturation Temperature, Function of pressure
- TSats: Saturation Temperature, Function of Entropy
- TTr: Water Temperature at Triple Point
- ufT: Saturated Liquid Specific Internal Energy, Function of...
- ugT: Saturated Gas Specific Internal Energy, Function of...
- uTD: Specific Internal Energy, Function of Temperature and Density
- uTp: Specific Internal Energy, Function of Temperature and...
- ViscTD: Dynamic Viscosity, Function of Temperature and Density
- vTp: Specific Volume, Function of Temperature and Pressure
- wfT: Speed of Sound of Fluid Phase, Function of Temperature
- wgT: Speed of Sound of Gas Phase, Function of Temperature
- wTD: Speed of Sound, Function of Temperature and Density
- wTp: Speed of Sound, Function of Temperature and Pressure
- ZTD: Compressibility Factor, Function of Temperature and Density