Pressure is everywhere in your life, but have you ever stopped to think about it? It’s in the air you breathe, the tyres on your car, and even in a glass of water.
Think of pressure as how much force is pushing on something. It’s a simple idea with big effects. From weather changes to gadgets, pressure plays a huge role in how things work.
In this guide, I will break down what is Density, its formula, units, and types of density. It is easy to understand and super fascinating. Ready to learn something new? Sit back, have a cup of tea, Let’s get started!
What is Density?
“Density measures how much mass is packed into a given volume of a substance.“
SI Unit of Density,
Kilograms per cubic metre (kg/m³).
Formula of Density,
Density (ρ) = Mass (m) ÷ Volume (V)
Example of Density,
If a block of wood has a mass of 500 kg and a volume of 2 m³, its density is:
Density(ρ) = Mass (m) ÷ Volume (V) = 500 ÷ 2 = 250 kg/m3
This means the wood’s density is 250 kg/m³.
Types of Density:
- Absolute density
- Relative density
- Bulk density
- Particle density
- Neutral density
- Area density
- Linear density
- Vapor density
- Agricultural density
Absolute density
“Absolute density refers to the mass of a substance per unit volume without considering external factors like temperature or pressure.“
SI Unit of Absolute density,
Kilograms per cubic metre (kg/m³).
Formula of Absolute density,
Absolute Density (ρ) = Mass (m) ÷ Volume (V)
Example of Absolute Density,
If a metal block has a mass of 800 kg and a volume of 0.4 m³, its absolute density is:
Absolute Density (ρ)=Mass (m) ÷ Volume (V) = 800 ÷ 0.4 = 2000 kg/m3
This means the metal’s absolute density is 2000 kg/m³.
Relative Density:
“Relative density compares the density of a substance to the density of water.“
SI Unit of Relative Density,
It has no unit since it is a ratio.
Formula of Relative Density,
Relative Density = Density of substance ÷ Density of water
Example of Relative Density,
If a substance has a density of 800 kg/m³ and water’s density is 1000 kg/m³, its relative density is:
800 ÷ 1000 = 0.8
Bulk Density
“Bulk density is the mass of a substance per unit volume, including air space.“
SI Unit of Bulk Density,
Si unit is kg/m³.
Formula of Bulk Density,
Bulk Density = Mass ÷ Volume (including voids)
Example of Bulk Density,
If the mass is 1200 kg and the volume is 1.5 m³, bulk density is:
1200/1.5 = 800kg/m3
Particle Density
“Particle density measures the mass per unit volume of individual particles.“
SI Unit of Particle Density,
Si unit is kg/m³.
Formula of Particle Density,
Particle Density = Mass of particles ÷ Volume of particles
Example of Particle Density,
A particle with mass 300 kg and volume 0.1 m³ has particle density 300 ÷ 0.1 = 3000 kg/m3
Neutral Density
“Neutral density compares the density of a substance to water, considering equal temperature and pressure.“
SI Unit of Neutral Density,
It has no unit since it is a ratio.
Formula of Neutral Density,
Neutral Density = Density of substance ÷ Density of water at standard conditions
Example of Particle Density,
A particle with mass 300 kg and volume 0.1 m³ has particle density 300 ÷ 0.1 = 3000 kg/m3.
Area Density
“Area density measures the mass per unit area of a surface.“
SI Unit of Area Density,
Si unit is kg/m².
Formula of Area Density,
Area Density = Mass ÷ Area
Example of Area Density,
A material with mass 50 kg and area 2 m² has area density 50 ÷ 2 = 25 kg/m2.
Linear Density
“Linear density measures mass per unit length.”
SI Unit of Linear Density,
Si unit is kg/m.
Formula of Linear Density,
Linear Density = Mass ÷ Length
Example of Linear Density,
A wire with mass 200 g and length 5 m has linear density 200 ÷ 5=40 g/m.
Vapor Density
“Vapor density compares the density of a gas to the density of hydrogen at the same temperature and pressure.“
SI Unit of Vapour Density,
It has no unit since it is a ratio.
Formula of Vapour Density,
Vapor Density = Density of gas ÷ Density of hydrogen
Example of Vapour Density,
A gas with density 2.2 kg/m³ and hydrogen’s density 0.09 kg/m³ has vapor density 2.2 ÷ 0.09 = 24.44 .
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Read More What is Velocity? Units, Formula, Types