No, not all objects can float in mid-water. The ability of an object to float in water depends on its density. Objects with a lower density than water will float, while objects with a higher density will sink.
The shape of an object can affect its ability to float in mid-water. Objects with a larger surface area relative to their weight, such as a boat, will float easily. However, objects with a smaller surface area, like a steel ball, will sink because they are more dense.
Gravity plays a significant role in an object's ability to float in mid-water. The force of gravity pulls objects down towards the Earth's center, causing them to sink in water. The upward force of buoyancy, which is determined by the object's volume and density, counteracts the force of gravity and allows an object to float in mid-water.
No, an object cannot float in mid-water if it is completely submerged. For an object to float, it needs to displace an amount of water equal to its weight. If an object is completely submerged, it is displacing an amount of water greater than its weight, causing it to sink.
The salinity, or salt content, of water can affect an object's ability to float in mid-water. Saltwater is denser than freshwater, so objects will float more easily in saltwater. However, the difference in density is relatively small, so the salinity of water typically has a minimal effect on an object's buoyancy in mid-water.