Density
i think buoyancy
Sinking or floating are determined by the density of the object.
The density of the object and the density of the liquid. The object must be less dense than the liquid to float.
An object will float if it has less density than the density of the liquid.An object will float if it has less density than the density of the liquid.An object will float if it has less density than the density of the liquid.An object will float if it has less density than the density of the liquid.
It isn't clear what units you are using, what liquid you are placing it in, and whether that is the density of the object or of the liquid. The general rule is that an object will float if it has less density than the liquid in which it is placed.
If the density of an object is lower than water then it will float, if the density is higher it will sink.
Shape and density
The weight does not determine if an object will float in water. If an object has a DENSITY that is more than the density of water then it will sink, if it's density is less than the density of water it will float.
If the density of the object is less than the density of the water it is placed in, the object will float and vice versa.
They can float without salt - It's the ratio of water displaced by the object in relation to its weight of the object that allows it to float - not the salt content of the water.
If it is lower it will float
The density of the object (mass/volume) compared to the density of the liquid.