Entrained moisture

[eeratm]

I have a question about entrained moisture. I have a problem that I can not deliver more than 10 grain/lb of entrained moisture to a system. Could someone help me understand what 10 grain/lb represents. I have never heard that type of measurement used. Thanks for the help.

 

[25362]

A grain is a unit of mass, in the UK and USA, common to the avoirdupois, troy, and apothecaries' systems equal to 1/7000 of a pound (=64.79891 mg). It is abbreviated gr.

There are psychrometric charts, for example, Perry VI, Fig. 12-2, which give the moisture content in both scales gr/lb, and lb/lb of dry air.

10 gr/lb dry air would be equal to 0.00143 lb/lb dry air.

Note the difference with gram, which is abbreviated either g or gm.