[Answer] What is density?

Answer: Density is the ratio of the mass of a substance to its volume.

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What is density? Particle density (packed density) - Wikipedia Density altitude - Wikipedia The density (more precisely the volumetric mass density; also known as specific mass) of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho) although the Latin letter D can also be used. ${\displaystyle \rho ={\frac {m}{V}}}$ where ρ is the density m is the mass and V is the volume. In some cases (for instance in the United States oil and gas industry) density is loosely defined as its weight per unit volume although this is scientifically inaccurate – this quantity is more specifically called specific weight . ${\displaystyle \rho ={\frac {m}{V}}}$ where ρ is the density m is the mass and V is the volume. In some cases (for instance in the United States oil and gas industry) density is loosely defined as its weight per unit volume although this is scientifically inaccurate – this quantity is more specifically called specific weight . For a pure substance the density has the same numerical value as its mass concentration . Different materials usually have different densities and density may be relevant to buoyancy purity and packaging . Osmium and iridium are the densest known elements at standard conditions for temperature and pressure . To simplify comparisons of density across different systems of units it is sometimes replaced by the dimensionless quantity " relative density " or " specific gravity " i.e. the ratio of the density of the material to that of a standard material usually water. Thus a relative density less than one means that the substance floats in water. The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance (with a few exceptions) decreases its density by increasing its volume. In most materials heating the bottom of a fluid results in convection of the heat from the bottom to the top due to the decrease in the density of the heated fluid. … Read more on Wikipedia Density is a measurement that compares the amount of matter an object has to its volume. An object with much matter in a certain volume has high d...

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