# How to convert specific humidity ERA5 in kg/kg to g/kg or mm/day?

The specific humidity of ERA5 data is kg/kg, but some articles work with this variable in g/kg. How can I convert this?

Or to compare with precipitation, evaporation, and other variables, how to convert to mm/day?

It is possible?

Thank you!

• Yes, a dimensional analysis shows that relative humidity is dimensionless, while the dimension of precipitation is LT$^{-1}$. Sep 13, 2022 at 15:51