The Pyschrometrics extension provides a set of functions for basic psychrometric calculations implemented in Axon. These functions were ported to SkySpark by Stephen Frank from Excel VBA macros originally written by Eric Kozubal.
Functions are individually documented. See also the psychrometricsExt repository on GitHub for a change log.
Regarding Log4j Vulnerability: psychrometricsExt is an Axon function resource extension and includes no Fantom or Java code. It is not affected by the Log4j vulnerability.