Question

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

Answer 1

pressure or try an experiment

Step-by-step 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.

Answer 2

You can tell that water is evaporating by measuring how much you have left in the container

If you star an experiment with 20ml of water and a few hours later there are 17ml you know 3ml of water evaporated