QUDT Unit Extension Ontology
Definition
Extension ontology for missing QUDT Unit instances, such as BAR_GAUGE and MilliBAR_GAUGE.
Note:
The units BAR_GAUGE and MilliBAR_GAUGE represent gauge pressure, i.e., pressure relative to the local atmospheric pressure.
Unlike absolute pressure units (e.g., BAR or PA), gauge pressure units cannot be converted to absolute pressure units
using a fixed conversion multiplier or offset, because the atmospheric pressure varies depending on the environment (e.g., altitude, weather conditions).
Currently, qudt:conversionMultiplier is set to 0 to indicate that no direct conversion is possible!
To address this limitation, we propose introducing a dedicated class or property that explicitly includes the conversionOffset as part of its definition.
This would allow the conversionMultiplier to be dynamically adjusted based on the local atmospheric pressure,
enabling accurate conversions between gauge and absolute pressure units.
The idea is to extend the unit representation so that the conversion process can account for the variable atmospheric pressure
by incorporating the conversionOffset into the unit's metadata. This approach would preserve the semantic meaning of gauge pressure
while enabling practical conversions in applications where the local atmospheric pressure is known.