Calculating Amount of water in air

[Tablet]

I am trying to locate the formula that will let me calculate the amount of water in air. Either in pounds or grains
I have a spread sheet with Wet bulb & dry bulb temperatures in the same for 6 months of working days.

Thanks

 

[saxon]

Tablet, I take it this is at atmospheric press. Why not just look it up on the standard psychrometric chart?

saxon

 

[Tablet]

Thank you for your reply
Yes this is at Atmospheric pressure.

My applicication involves tableting of a hygroscopic powder.

I am looking for a single data point at which severe sticking occurs on the punch faces.
RH% is not a good indicator because of temperature swings in the processing area. I believe the actual measure of water available for the powder to absorb will be a better indicator.

I have months of spreadsheet data, wet bulb & dry bulb temperatures for each day along with a rating on sticking severity. I would like to plug this formula into the spreadsheet in order to save time of looking every one up on the chart.

Thank you

 

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