#### 8.9.2.18 IfcPHMeasure

IfcPHMeasure is a measure of the molar hydrogen ion concentration in a liquid (usually defined as the measure of acidity) in a range from 0 to 14.

> HISTORY New type in IFC2x2.

XSD Specification:

<xs:simpleType name="IfcPHMeasure">
<xs:restriction base="xs:double"/>
</xs:simpleType>
<xs:element name="IfcPHMeasure-wrapper" nillable="true">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="ifc:IfcPHMeasure">
<xs:attributeGroup ref="ifc:instanceAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>

EXPRESS Specification:

TYPE IfcPHMeasure = REAL;
| WHERE
WR21 | : | {0.0 <= SELF <= 14.0} |
END_TYPE;

EXPRESS-G diagram

Formal Propositions:

WR21 | : | The pH value shall be in the range from 0 to 14.

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