MTDATA – Phase Diagram Software from the National Physical Laboratory

 

 

 

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CLASSIFY

Function:

allows the status of substances to be classified as NORMAL or ABSENT for the purposes of a subsequent calculation.

Parameters:

absent

normal

Defaults:

normal = <all substances>

Examples:

classify normal substance(14) !

classify absent "CO2<g>" 12 46 substance(13) !

classify absent sub(*) nor sub(1-3,5,9) !


Parameter values:

ABSENT, NORMAL   take the value [substance(*)]

[ ] = possible omission or repetition

A substance CLASSIFY'd as NORMAL is part of the system, whilst something ABSENT is temporarily excluded until restored. 

SUBSTANCE(*)

where the subscript can be * (for all substances) or any valid number or list of numbers obtained from the relevant list separated by commas or hyphens. (1-3,5,9) means 1, 2, 3, 5 and 9.

Substances may also be specified in two other ways:

(a) by quoting the substance number alone.
(b) by giving the substance name, together with its correct phase label, enclosed in quotes; the correct substance name and phase label can be obtained from the relevant list given under the LIST command. This method of specifying the substance is available only if components are elements.

General comments:

The ABSENT/NORMAL classification is in effect a toggle that causes substances to be excluded or included when the calculation is performed. It can be used as many times as is desired on the same entity within the same session. Although the menu includes components and phases these should not be classified as ABSENT.

 

Updated 6 July 2010