Give reasons for the following.
Evaporation can be desirable or undesirable.
Evaporation:
Evaporation as a desirable change:
Evaporation as an undesirable change:
Thus, evaporation can be a desirable or undesirable change.
Curdling of milk can be desirable or undesirable.
Give an example to show that a change can be desirable and undesirable at the same time
Give examples of desirable and undesirable changes?