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Question: What is C.G.S. unit of density? A. \[gc{m^{ - 3}}\] B. \[g{m^{ - 3}}\] C. \[gc{m^{ - 2}}\] D...

What is C.G.S. unit of density?
A. gcm−3gc{m^{ - 3}}
B. gm−3g{m^{ - 3}}
C. gcm−2gc{m^{ - 2}}
D.kgm−3kg{m^{ - 3}}

Explanation

Solution

Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).

Complete step by step answer:
The gram per cubic centimeter is a unit of density in the CGS system, commonly used in chemistry, defined as the mass in grams divided by volume in cubic centimeters.
1  g/cm3  is equivalent to= 1000  g/L  (exactly)= 1000  kg/m3  (exactly)1\;g/c{m^3}\;is{\text{ }}equivalent{\text{ }}to = {\text{ }}1000\;g/L\;\left( {exactly} \right) = {\text{ }}1000\;kg/{m^3}\;\left( {exactly} \right)
≈ 62.42796  lb/ft3  (approximately)\approx {\text{ }}62.42796\;lb/f{t^3}\;\left( {approximately} \right)
≈ 133.52647  oz/gal  (approximately)\approx {\text{ }}133.52647\;oz/gal\;\left( {approximately} \right)
1  kg/m3  = 0.001  g/cm3(exactly)1\;kg/{m^3}\; = {\text{ }}0.001\;g/c{m^3}\left( {exactly} \right)
1  lb/ft3  ≈ 0.01602  g/cm3  (approximately)1\;lb/f{t^3}\; \approx {\text{ }}0.01602\;g/c{m^3}\;\left( {approximately} \right)
1  oz/gal  ≈ 0.00749  g/cm3  (approximately)1\;oz/gal\; \approx {\text{ }}0.00749\;g/c{m^3}\;\left( {approximately} \right)

Additional information:
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 fluid results in convection of the heat from the bottom to the top, due to the decrease in the density of the heated fluid. This causes it to rise relative to more dense unheated material.
The reciprocal of the density of a substance is occasionally called its specific volume, a term sometimes used in thermodynamics. Density is an intensive property in that increasing the amount of a substance does not increase its density; rather it increases its mass.

So, the correct answer is Option C.

Note: Units are standards for measurement of physical quantities that need clear definitions to be useful. The reproducibility of experimental results is central to the scientific method. A standard system of units facilitates this.