
Vaporous
Physical Presence
Use 'vaporous' to describe something with a visible but lightweight or diffuse presence, like steam or fog. 
Ethereal Quality
Use 'vaporous' when something has an ethereal or ghostly quality, giving an impression of mystery or elusiveness. 
Describing Aromas
Describe scents that seem light and diffuse through the air as 'vaporous' to emphasize their subtlety. 