As the vapor rises, it cools. You see clouds when droplets form. As these droplets collect more moisture, they become heavy enough to fall to earth as rain. Place both, uncovered, on the table to stand overnght. Check them in the morning.
Less water remains in the flat dish than in the narrow jar.
Water molecules can escape only from the surface. So water will evaporate faster when the surface is large. A wide shallow puddle will dry up more quickly than a deep, narrow one. The dish in the sun dries first. The Weather Team and Kathee Terry Tell us what you think about this page.