We explain that what are the examples of density? with definition, measurement unit, density measurement, apparent density and real density. In addition: density of chemical elements.
Examples of Density examples of density
The density is the property of matter that tells us how much mass is a substance in each unit volume.
Measurement units examples of density
Density is measured in the following units:
Kilograms per Cubic Meter (Kg / m 3 )
Grams per Cubic Centimeter (g / cm 3 )
Pounds per cubic inch (lb / in 3 )
Pounds per cubic foot (lb / ft 3 )
Density can be measured across the board. For example, when measuring at home, use a container that has a known volume, such as a glass or jug, and can be filled with the substance, be it solid or liquid. examples of density
Knowing the mass of the empty container, having a scale at hand, measure that of the full container. By mass difference, the mass of the substance in the container is known.
Density is calculated by dividing the mass of the substance by the volume occupied in the container.
m substance = m full – m empty
ρ = m substance / V
When the density is measured in the laboratory, and the substance is gaseous, a rigid, spherical container of known and constant volume is used. Knowing the mass of gas put into the container, the division of this mass by the volume of the container will be calculated. A property of gases is that they cover the entire volume of the container they occupy.
When the density is measured in the laboratory, and the substance is liquid, a container called a Pycnometer will be used, which is a glass container designed exclusively to measure density. The name “Pycnometer” comes from the Greek root meaning “Density Meter”. To start measuring, fill the pycnometer with the liquid, leaving it completely filled and well sealed, to ensure the exact volume. Knowing the mass of the empty pycnometer to discard it, divide the mass of the liquid substance by the volume of the pycnometer.
When density is measured in the laboratory and the substance is solid, common volume meters such as test tubes are used. The test tube is filled with the solid substance, generally in powder (if the grains are very thick, a test tube is no longer used), and the same procedure is carried out to weigh it, taking into account that the mass of the test tube must be discarded to know that of the solid. examples of density
In the case of solids, being a granular material, there will be air that covers the empty spaces, so the density will be less clear the more spaced the particles are. This brings us to two variants of Density: Apparent Density and Real Density.
Apparent Density and Real Density
The Apparent Density is that which is measured when the solid is just emptied into the specimen, even with all that air involved in its emptying. Sometimes Bulk Density is still divided into Loose Bulk Density, which is measured with freshly cast material, and Compact Bulk Density, which is measured after impacting the filled specimen to better accommodate the solid.
The Real Density refers to that which is already measured with more specialized instruments than the test tubes, for example using balances that give measurements with up to four decimal places.
Examples of Density
It is assumed that several different masses and volumes are measured, with different units of measurement.
Density of Chemical Elements:
Chemical Elements in their natural state have very varied densities, depending on the size of their atoms and how they are arranged. Examples of the densest and least dense elements are mentioned.
The Denseest elements are:
Osmium, with 22.6 g / cm 3
Iridium with 22.4 g / cm 3
Platinum with 21.45 g / cm 3
Rhenium with 21.04 g / cm 3
Neptunium with 20.2 g / cm 3
Plutonium with 19.84 g / cm 3
Tungsten with 19.35 g / cm 3
Gold with 19.32 g / cm 3
Uranium with 18.95 g / cm 3
Tantalum with 16.65 g / cm 3
Protactinium with 15.4 g / cm 3
Californium with 15.1 g / cm 3
Berkelium with 14.78 g / cm 3
Americium with 13.67 g / cm 3
Mercury with 13.55 g / cm 3
The least dense are:
Hydrogen with 0.09 g / cm 3
Helium with 0.18 g / cm 3
Lithium with 0.53 g / cm 3
Potassium with 0.86 g / cm 3
Neon with 0.9 g / cm 3
Sodium with 0.97 g / cm 3
Nitrogen with 1.25 g / cm 3
Oxygen with 1.43 g / cm 3
Calcium with 1.55 g / cm 3
Rubidium with 1.63 g / cm 3
Fluorine with 1.7 g / cm 3
Magnesium with 1.74 g / cm 3
Argon with 1.78 g / cm 3
Phosphorous with 1.82 g / cm 3
Beryllium with 1.85 g / cm 3
So each cm3, or milliliter of volume of each item will have that weight in grams. The order of the least dense obeys the continuity of atomic numbers of the elements in the Periodic Table.