Water Grains?

Sorry to drag this up again:
I’ve been playing with all the custom tags, and the %abshum% one cought my eye, for whatever reason.
I actually uploaded the list of custom tags to my site so they all got processed (so i could see which ones worked for me):
http://www.kingsteignton-weather.co.uk/wx40.html

If you CTRL+F and search for “Absolute” you’ll find it quicker…
You’ll see it shows

53.3703…Absolute humidity, kg/m3 <-bolding mine

which doesn’t really compare well with what Jeep says above (Kg not g).
I have read the whole topic and remember that Brian adjusted the result to be in g/m^3 - is this just a case of the tag description not being up to date?
I was gobsmacked when I first saw that! 50 kilos of water vapour in a cubic metre!

G’day guys,

First post here. Sorry if its off topic. I was interested in working out if there is any kind of conversion to turn amount of transpired (water) grains from a crop into something more like mass/volume or mass/area?

See the link below, which discusses wheat and peas transpiring 100,000 grains … Is what I want to do even possible?

http://trove.nla.gov.au/ndp/del/article/3423878?searchTerm=((mccallum malcolm) OR (biology tests problems exercises) OR (plant physiology study teaching) OR (transpiration)) NOT (id:65845184)&searchLimits=

Cheers

Jesse