Water in the form of vapor enter the atmosphere. The vapor accumulates in the atmosphere to form clouds. Once the clouds are heavy enough, the water in the form of droplets fall towards land or as rain. It could also be in the form of other precipitation such as snow or hail. As the sun hits the waters in the land, it causes the water to evaporate and the cycle continues.
The nurse should check if the 2 - month old infant has voided.
This should be done because kidney function may fail with diarrhea. So, it is important to check if the kidney functions properly before adding potassium (to prevent hyperkalemia).