http://www.xdocs.ls-universe.info/pie.php?xStatsClass


memAvailable(units)
Amount of physical memory currently available.

memInUse(units)
Amount of physical memory currently in use.

memTotal(units)
Total amount of physical memory in the system.



swapAvailable(units)
Amount of swap space currently available.

swapInUse(units)
Amount of swap space currently in use.

swapTotal(units)
Total amount of swap space in the system.




[memAvailable(bytes)] --> 25165824
[memAvailable(KB)] --> 24576
[memAvailable(MB)] --> 24
[memAvailable(GB)] --> 0.02
[memAvailable(%)] --> 38


Hope that helps...