TC

This function returns the critical temperature of a pure component by CAS number using available literature and database methods.

Critical temperature is the highest temperature at which liquid and vapor phases can coexist for a pure substance and is used in reduced-property and equation-of-state workflows.

Excel Usage

=TC(CASRN, method)

• CASRN (str, required): CAS Registry Number for the target chemical (-).
• method (str, optional, default: null): Optional data source method name; leave empty for automatic selection (-).

Returns (float): Critical temperature in kelvin (K).

Example 1: Critical temperature of water

Inputs:

CASRN
7732-18-5

Excel formula:

=TC("7732-18-5")

Expected output:

647.096

Example 2: Critical temperature of ethanol

Inputs:

CASRN
64-17-5

Excel formula:

=TC("64-17-5")

Expected output:

514.71

Example 3: Critical temperature of methane

Inputs:

CASRN
74-82-8

Excel formula:

=TC("74-82-8")

Expected output:

190.564

Example 4: Critical temperature of benzene

Inputs:

CASRN
71-43-2

Excel formula:

=TC("71-43-2")

Expected output:

562.02

Python Code

Show Code

from chemicals.critical import Tc as chemicals_tc

def tc(CASRN, method=None):
    """
    Retrieve the critical temperature of a chemical by CAS number.

    See: https://chemicals.readthedocs.io/chemicals.critical.html

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

    Args:
        CASRN (str): CAS Registry Number for the target chemical (-).
        method (str, optional): Optional data source method name; leave empty for automatic selection (-). Default is None.

    Returns:
        float: Critical temperature in kelvin (K).
    """
    try:
        value = chemicals_tc(CASRN=CASRN, method=method)
        if value is None:
            return "Error: Critical temperature data is not available for the provided CASRN"
        return value
    except Exception as e:
        return f"Error: {str(e)}"

Online Calculator

CASRN *

CAS Registry Number for the target chemical (-).

method

Optional data source method name; leave empty for automatic selection (-).