Three characteristics that are unique to mammals include their  ability to feed their babies with milk made in their mammary  glands. Mammals also have hair on their bodies â¦and they have a  single bone that makes up their lower jaw.
buoyancy. n. 1. the ability to float in a liquid or to rise in a fluid. 2. (General Physics) the property of a fluid to exert an upward force (upthrust) on a body that is wholly or partly submerged in it. 3. the ability to recover quickly after setbacks; resilience.
Buoyant force refers to the amount of pressure exerted on a particular object when placed on some kind of fluid.In scientific terms, fluids may either be liquid or gas. This concept is based on the Archimedes principle that the force acting on an object in a liquid is equal to the weight of the displaced fluid.his explains why the buoyant force or pressure at the bottom of a particular object is greater than the force on top. And regardless of the objectâs weight or density, whether it floats or sinks, some buoyant force is still present.