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

EXPRESS Specification:

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

Link to EXPRESS-G diagram EXPRESS-G diagram

Formal Propositions:

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

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