We cannot see evaporation because water vapor is invisible. how can we tell it is happening?

pressure or try an experiment

Explanation:

Water vapor imagery is created using a wavelength sensitive to the moisture content in the atmosphere. In this imagery, bright blue and white areas indicate the presence of high water vapor or moisture content, whereas dark orange and brown areas indicate little or no moisture present.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it