The phrase "buoyant force" refers to the upward force exerted on an object when it is submerged in a fluid (typically a liquid or gas). This force allows the object to float or remain partially or entirely suspended in the fluid. Full definition
But if moist air is surrounded by equally moist air, there is no net buoyant force. (planet3.org)
And as long as the ship displaces enough water to create a strong buoyant force, it can stay afloat — even if it is loaded with cargo. (scientificamerican.com)
If, on the other hand, the object displaces a lot of water, then there will be a large buoyant force pushing upward. (scientificamerican.com)