Density si unit
- how is density determined
- how is population density determined
- how is bone density determined
- how is breast density determined
Density in chemistry!
How To Determine The Density Of Solid Materials
In physics, the density of a sample of material is just the total mass of the sample divided by its volume, regardless of how the matter in the sample is distributed (a concern that does affect the mechanical properties of the solid in question).
An example of something that has a predictable density within a given range, but also has greatly varying levels of density throughout, is the human body, which is made up of a more or less fixed ratio of water, bone and other types of tissue.
Density of water
Density is expressed using the Greek letter rho:
\(\rho=\frac{m}{V}\)
Density and mass are both often confused with weight, although for perhaps different reasons. Weight is simply the force resulting from the acceleration of gravity acting on matter, or mass:
\(F=mg\)
On Earth, the acceleration owing to gravity has the value 9.8 m/s2.
A mass of 10 kg thus has a weight of (10 kg)(9.8 m/s2) = 98 Newtons (N).
Weight itself is also confused with density, for the simple reason that given two objects of the same size, the one
- how is relative density determined
- how is density altitude determined