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The density of a substance is the ratio of its mass to its volume. So, I would measure the mass and volume of a substance to calculate density.
It would sink until it was completely covered with water and then neither go farther down nor up.
Nothing would happen to its density.
If an object was less denser than water it would float
I haven't seen it in context, so I am not sure. However, I would expect it to mean, the density, compared to that of some other substance.
Normally when you heat a substance its volume increases while mass stays the same. It may not be noticable but the density would decrease.
The density of a substance is the ratio of its mass to its volume. So, I would measure the mass and volume of a substance to calculate density.
It would sink until it was completely covered with water and then neither go farther down nor up.
That would depend upon the density of the oil (which will depend upon temperature), how absorbant of oil the substance was and how deep the oil is. Assuming the substance does not absorb any of the oil then depending upon the oil various things would happen: In some oils such as Car oils, Coconut oil, Crude oil California, Linseed oil which all have a density less than 0.95 g/ml the substance would sink (unless the oil was not deep enough in which case the substance would sit on the bottom of the container and appear above the surface of the oil). In other oils such as Castor oil, Crude oil Mexican, Rosin oil which all have a density greater than 0.95g/ml the substance would float.
0,00045 dag/mm3.
Nothing would happen to its density.
Density = Mass/Volume so you need to measure the mass of the substance and divide by the volume that it occupies.
No substance 'consists' of density. Rather density is a property of matter or substance. It is the amount of matter of a substance in a certain volume of that substance. A combination of a unit of mass (eg. kilogram) and a volume (eg. a cubic metre) You would say that a substance has a density of so many kilograms in a cubic metre.
A substance with density equal to 2.1 gcm3 it's sinking in water.
A substance with approximately the same density as water.
A substance with a density of 1.3gcm-3 would sink in water. Float (APEX)
Compared to a low density substance and all other things being equal, it would be heavier.