Hopefulness is a related term of buoyancy.
As nouns the difference between hopefulness and buoyancy
is that hopefulness is the property of being hopeful while buoyancy is (label) the upward force on a body immersed or partly immersed in a fluid.
hopefulness
English
Noun
(-)
The property of being hopeful.
Antonyms
* hopelessness
buoyancy
English
Noun
(label) The upward force on a body immersed or partly immersed in a fluid.
The ability of an object to stay afloat in a fluid.
(label) Resilience or cheerfulness.
Related terms
* buoyant
* buoy
* buoy up
See also
* Archimedes' principle