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Boyle's Law in daily life

Before starting with applications of Boyle's Law in daily life we need to know who actually he was.....

  • WHO is Robert Boyle ??

  • Robert Boyle was an Anglo-Irish chemist, physicist, inventor and natural philosopher.

  • Born: 25th January 1627

  • Died: 31st December 1691

  • He is highly remembered today as the first modern chemist, and indeed one of the founders of modern chemistry as well as one of the pioneers of modern experimental scientific method.

  • He is credited with inventing Boyle's law.

  • He is also know for his theory on "Corpuscularianism".

  • WHAT is Boyle's Law ??

  • Boyle's Law gives us the relationship between the Pressure and Volume of Gas of a given mass which is kept at constant temperature.

  • It states "the pressure exerted by the gas is inversely proportional to the volume occupied by it."

  • Basically it means that the pressure and volume of the gas are inversely proportional to each other as long as the temperature and quantity of the gas remains constant.

  • As per law, any change in the volume occupied by a gas (at constant quantity and temperature) will result in a change in the pressure exerted by it.

  • The product of the initial pressure and the initial volume of a gas is equal to the product of its final pressure and final volume (at constant temperature and number of moles).


  • P1 is the initial pressure exerted by the gas

  • V1 is the initial volume occupied by the gas

  • P2 is the final pressure exerted by the gas

  • V2 is the final volume occupied by the gas

  • This equation can be used to predict the increase in the pressure exerted by a gas on the walls of its container when the volume of its container is decreased

  • WHAT are it's Application ? WHERE can see it our daily lives ??

  • Syringes:

We all have seen a syringe while visiting a doctor. It consists of a hollow cylinder called a barrel and a sliding plunger attached to it. The working principle of a syringe is like a reciprocating pump. When the plunger is pushed, the fluid will inject, and when the plunger is pulled, the fluid will withdraw. The pushing of the plunger reduces the volume of the fluid in the barrel. This reduction in the volume causes a momentary increase in the pressure of the fluid, and the fluid is injected into the patient's body. In a similar way, the pulling of the plunger increases the volume of the fluid. It results in a momentary decrease in the pressure of the fluid, and external fluid is withdrawn. Well you can see it for yourselves at the nearby Vaccination centers. Book your slots and gear up against Covid.

  • Bicycle Pump:

A hand bicycle pump works similar to a syringe. When the handle of a pump is pushed down, the pressure inside the pump will increase momentarily. In other words, the gas inside is compressed. As a result, the pressurized gas is forced inside the tire of a vehicle.

  • Space :

In outer space, there is no atmosphere, no air, and no pressure. This state of no pressure is called a vacuum. Thus, any pressurized gas in space will expand infinitely as per Boyle's law. Astronauts in space protect themselves by wearing their spacesuits, which can withstand extreme pressures and temperatures. In case their spacesuits get damage, and their body is exposed to space, they are as good as dead. It is the worst nightmare for them. It's because their blood and other bodily fluids will start boiling on exposure to space.

  • The Bends:

The bends are decompression sickness experienced by scuba divers when they ignore Boyle's law. As a diver dives deep inside water, the surrounding pressure of the water increases. The high pressures increase the solubility of the bodily gases in the blood of the diver. The deeper a divers goes, the more the quantity of gases dissolves inside the blood of the diver. When he/she ascends, the dissolved gases start expanding since the pressure gets lower. A well-trained diver will always ascend slowly. But if he/she somehow makes a rapid ascent, the diver will suffer in severe pain. The gases in the body of the diver will expand quickly, making the blood a foamy solution. Moreover, the gases between joints will also expand, which will cause the diver's body to blend. This sometimes can be a life-threatening condition.

NOTE: Every 10 meters of depth, pressure increases by 1 atm or 14.7 psi.

  • Human Lungs:

The lungs are an important organ of the body. They play a vital role in the respiratory system. As the lungs expand, there is a momentary reduction in the pressure. Thus, the pressure inside the body is lower than the outside. Consequently, the surrounding air slips in the body. This process is called inhalation. When the lungs relax, the volume of the lungs decreases, which increases the pressure momentarily relative to the outside. And the air is exhaled from the body.

There are many such examples which include Spray Paint cans, Deep ocean fishes, Soda bottle/cans, etc. So in the conclusion, we can say that we are having many things around us that are based on Boyle's Law which we aren't probably aware of... Straight from breathing to Vaccination 😜. So the time we defeat Covid with our vaccines thank Robert Boyle.

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