WHAT IS DENSITY

What is Density?

The particular mass per volume of a substance is defined as the density 

• Density is the ratio between mass and volume or mass per unite volume   

• Density can be changed by changing either the pressure or temperature

• Density is the most fundamental of all the physical properties. It applies to the substance in any of the three states namely solid, liquid, or gas.

• By measuring the density of process steam, one can determine its concentration, composition or, in the case of fuel, its calorific value.density is define  

• since the volume of the most substance change with temperature, the density depends on the temperature and pressure of the substance 

• increasing the temperature of a simple of a substance generally increases its volume and therefore decreases its density 

SI unit of Density

• Kilogram per cubic (kg/m3)

• grams per cubic centimeter (g/cm3).

• kilogram per meter (kg/m3) 

• gram per liter or (g/ml)

Equation

density Is defined as the mass per unit volume of a substance under fixed condition. it is usually denoted by the Greek letter ROH() and is given by 

                       q = m/v     kg/m3

PURPOSE OF DENSITY MEASUREMENT

there are some important reason to measurement density 

1. to determine  the mass and volume of products 
2. to asses the quality of products.
3. to ascertain the value of the product 
4. to determine the concentration or composition of the process stream 
5. to determine calorific value of fuels 
6.to convert volumetric flow measurement into mass flow information