Why clouds are fluffy

Clouds aren't physical to touch but they are "fluffy" from the cause of vaporized water and the gas and materials that made this "fluffy cloud" on the sky.

Cumulus clouds form in rising air. The cloudy air becomes warmer than its surrounds and continues to rise as a buoyant thermal. These thermals transport the cloud droplets upwards; they grow from more condensation or from colliding with other drops