Since density is mass divided by volume, any object with no mass has no density. Photons are a good example
Mass = Density Volume
It will float in water, and in any other fluid whose density is greater than the object's density.
Well, obviously they do. Any material object has a density.
The density of an object is related to the density of the fluid it is in because if the density of the object is less than the fluid than it will float. If this density of the object is greater than the density of the fluid it will sink to the bottom.
An object will float in water if its density is lower than water which means that for an object to float, its density needs to be less than ~1 gram/centimeter^3,
Change the temperature.
Any OBJECT with a DENSITY of LESS THAN ONE (1), will SINK in WATER.
A less dense object or any other substance will float on a more dense liquid.
Some objects will float on water as the density of the object is less than that of water. Conversely, if an object is more dense than the density of water, then it will sink.
An object will float in water if the object's density is less than the density of water. Relative density is the ratio of one object density with respect to the density of another object. Relative density of any object with respect to water is also known as specific gravity. Objects with a specific gravity less than one will float those with a specific gravity greater than one will not.
If you divide the mass by the volume, for any object, you get its density.
The density of any object is defined by how close its atoms are bundled (For a better word) together i.e. lead is very dense.