SUBmerged means that the entire thing is completely UNDER the fluid surface.
IMmersed means that the thing has some part IN the fluid ... that is the part whose Volume displaces the fluid, which has buoyant force applied to it.
(So, "completely immersed" is not redundant, but it means "submerged")
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A submerged body is completely below the surface of a liquid, while an immersed body has a portion above and below the liquid surface. Submerged bodies experience buoyant forces acting upward, while immersed bodies experience buoyant forces acting both upward and downward.
Spring balance shows remarkably less weight of yours, when immersed in the water. Your weight will be shown less as much the weight of water you have displaced.
No, a body totally submerged in a liquid displaces a volume of water equal to its own volume. This is known as Archimedes' principle, which states that the buoyant force acting on an object is equal to the weight of the fluid displaced by that object.
In order to measure volume, one normally sees how much water it displaces. If the body floats, the water displaced will be equal to the weight of the body, not the volume. It will be necessary to force the body down so that it is totally submerged. If there is an anchor and chain below the surface, the water displaced when the body is attached and submerged will have the same volume as the body.
In warm water, a dead body may resurface within a few days to a few weeks due to decomposition gases, while in cold water, the body may remain submerged for a longer period of time, potentially several weeks to months, before resurfacing due to the slower decomposition process. The exact time can vary based on factors such as water temperature, depth, and presence of aquatic life.
When your fingers are submerged in salt water, the body's natural response is to reduce the amount of water in the skin to reduce its permeability to salt. This process, regulated by the autonomic nervous system, prevents excessive water absorption and swelling that would cause wrinkling.