(a.) That may be floated.

adaptable adaptive afloat airy animated blithe bouncy breezy bright carefree cheerful convalescent corky debonair ebullient effervescent elastic expansive extensile flexible flexile floatable floating floaty free and easy jaunty light light-hearted lighthearted lightsome lively peppy perky recuperative recuperatory resilient responsive reviviscent springy stretch stretchable stretchy supernatant vivacious volatile