Yes! Now you can do calculations from your android mobile.. No need to carry your laptop..Refer charts etc etc This application will help you to know the relative humidity and air humidity ratio. This application is for HVAC & Process Engineers and Designers. This calculation would have taken eight hour of your time to put it in a excel WorkSheet, develop the macros and then execute in your laptop( if you know programming.) Now it is cut down to a few seconds by use of this program. Source is ASHRAE handbook.