I enter a vapor pressure value in bar, and it is converted to the value in kPa, why is that?

For pressure value data it is important to differentiate between absolute pressure values and gauge pressure values.

For all conversion groups, that are configured to require entry of pressure values, these values can either be a gauge or an absolute pressure value.

The behavior described in this FAQ question is defined within dedicated MQCI pressure conversion functions, that convert gauge pressure values to absolute pressure values – visible to the user and using the base pressure UoM as absolute (or vice versa).
If you do not require this behavior, you may replace the MQCI pressure conversion function with the corresponding function that treats all UoM as either all absolute or all gauge values, for all UoM. Read the Pressure Value FAQ for more details.

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