TSAT_IAPWS

This function computes the saturation temperature corresponding to a specified water vapor pressure using the explicit IAPWS inverse relation. It supports pressure-to-boiling-temperature conversions in process calculations.

The inverse saturation mapping is:

T_{sat} = f^{-1}(P)

where P is saturation pressure and T_{sat} is saturation temperature.

Excel Usage

=TSAT_IAPWS(P)

• P (float, required): Water saturation pressure (Pa).

Returns (float): Saturation temperature of water at the specified pressure (K).

Example 1: Saturation temperature near one atmosphere

Inputs:

P
101325

Excel formula:

=TSAT_IAPWS(101325)

Expected output:

373.124

Example 2: Saturation temperature at reduced pressure

Inputs:

P
50000

Excel formula:

=TSAT_IAPWS(50000)

Expected output:

354.467

Example 3: Saturation temperature at elevated pressure

Inputs:

P
500000

Excel formula:

=TSAT_IAPWS(500000)

Expected output:

424.986

Example 4: Saturation temperature near critical pressure

Inputs:

P
20000000

Excel formula:

=TSAT_IAPWS(20000000)

Expected output:

638.896

Python Code

Show Code

from chemicals.iapws import Tsat_IAPWS as chemicals_tsat_iapws

def tsat_iapws(P):
    """
    Compute water saturation temperature from pressure with the explicit IAPWS equation.

    See: https://chemicals.readthedocs.io/chemicals.iapws.html#chemicals.iapws.Tsat_IAPWS

    This example function is provided as-is without any representation of accuracy.

    Args:
        P (float): Water saturation pressure (Pa).

    Returns:
        float: Saturation temperature of water at the specified pressure (K).
    """
    try:
        return chemicals_tsat_iapws(P)
    except Exception as e:
        return f"Error: {str(e)}"

Online Calculator

P *

Water saturation pressure (Pa).