ChemPhase Explorer - Chemical Phase Diagrams & Thermodynamic Properties

Phase Diagram (P-T)

Pressure vs. Temperature Equilibrium

P Unit:

T Unit:

Dynamic Point Inspector

LIQUID PHASE

Temperature ($T$): 298.15 K (25.0 °C)

Pressure ($P$): 1.013 bar (1.00 atm)

Estimated Density ($\rho$) 997.0 kg/m³

Vapor Pressure ($P_{sat}$) 0.0317 bar

Reduced Temp ($T_r = T/T_c$) 0.461

Reduced Press ($P_r = P/P_c$) 0.0046

Water (H₂O)

H₂O

CAS: 7732-18-5 MW: 18.015 g/mol IUPAC: oxidane

Phase Equilibrium Points

Triple Point ($TP$) 273.16 K (0.01 °C) 0.006117 bar (611.65 Pa)

Critical Point ($CP$) 647.10 K (373.95 °C) 220.64 bar (217.75 atm)

Normal Boiling Point (1 atm) 373.15 K (100.0 °C) $\Delta H_{vap}$: 40.66 kJ/mol

Normal Melting Point (1 atm) 273.15 K (0.0 °C) $\Delta H_{fus}$: 6.01 kJ/mol

Compound Property Matrix

Property Name	Symbol	Value & Unit	Standard Conditions	Source / Model

Property Name	Symbol	Value & Unit	Conditions	Description

Thermodynamic Equations & Scientific Data Origin

Antoine Equation

$$\log_{10}(P_{\text{sat}}) = A - \frac{B}{T + C}$$

Calculates Vapor-Liquid saturation curve where $P_{\text{sat}}$ is in bar, $T$ in Kelvin.

Simon-GDT Equation

$$P = P_{tp} + a \cdot \left[ \left(\frac{T}{T_{tp}}\right)^c - 1 \right]$$

Calculates High-Pressure Solid-Liquid melting equilibrium boundary.

Peng-Robinson EOS

$$P = \frac{RT}{V_m - b} - \frac{a(T)}{V_m^2 + 2bV_m - b^2}$$

Real gas density & phase behavior estimation across supercritical regions.

Are properties lab-tested or auto-generated?

It is a synthesis of both! Fundamental anchor points—such as the Triple Point ($T_{tp}, P_{tp}$), Critical Point ($T_c, P_c$), Normal Boiling/Melting points, and Enthalpy of Vaporization ($\Delta H_{vap}$)—are empirically measured in physical laboratories through calorimetry, dilatometry, and phase cell experiments over decades.

However, continuous phase diagrams and state properties across arbitrary $P-T$ grids are auto-generated mathematically using thermodynamic Equations of State (EOS) taking empirical constants as input parameters!