An ideal gas is a speculative gas made from many subjectively moving point particles that are not open to interparticle associations. The perfect gas thought is crucial since it conforms to the best gas law, deals with the condition of the state, and is agreeable to interpret under actual mechanics. Thus, an ideal gas is nothing but a gas that obeys Boyle’s and Charles’ law under all temperature and pressure conditions. The application of Charles law can also be seen in our kitchens. For example: For making bread cake, etc. The Charles law tells us that volume changes according to the temperature, which must be Kelvin.

Definition of Charles’ law

The scientist Charles and Gay-Lussac measured the expansion that occurs in gas on heating.

They found a linear increase in volume with temperature (calculated on the mercury centigrade scale) at constant pressure and a fixed amount of gas. 

Charles law concludes that the volume of a given gas mass is directly proportional to its temperature (in Kelvin) at constant pressure. Let us assume that the volume of the gas is denoted by V and the temperature of the gas is denoted by T at constant Pressure P.  We can say that in Charles Law, volume changes according to the temperature in both positive and negative manner at constant pressure, which the gas is exerted.

Formula or equation of Charles law

Assume that volume of a gas is ”V” and the temperature of a gas is ”T” at constant pressure ”P”, then, 

V ∝ T (at constant P)

Alternatively, V = k T, where k is known as the constant of proportionality.

Thus, we can also write, V T = k

Proof or derivation of Charles law

Let V1 be the volume of gas at temperature T1, and V2 is the volume of gas at temperature T2 at constant pressure.

V1/T1 = constant ………eq.1

And V2/T2 = constant ……….eq.2

therefore, on comparing the equation 1 and 2, we get

V1/T1=V2/T2

which is the proof of Charles’s law. Note that the temperature here is measured in Kelvin.

Thus, the content of Charles’ law is simply that the thermal expansions of gases and liquid mercury are mostly similar. The explanation for Charles’ law at the molecular level lies in the fact that when the temperature increases, the molecules move faster and hit the walls harder and more often. Therefore, if the pressure is constant, it is necessary to increase the volume.

Applications of Charles law in real-life examples 

Some examples of the application of Charles law in real life

• A scientist named Jacques Charles has explained that the volume of gases increases when the temperature rises and decreases when temperature decreases. He utilised his discovered law to make a sight-seeing (hot-air) balloon, which is a famous application of Charles law in real life.

• We apply the Charles law ordinarily in our real life. Let us start with an elementary example; soda-can. When you open a chilled can, you merely see bubbles, but bubbles spill out the drink if you open a little warmer can. Why is this so? This happens because of Charles’s law. The volume of gas increases in case of a warmer can, and as you open the can, gas molecules find their way to come out.

• Another example of applying  Charles law in real life is bread and delicious cakes. We use yeast for fermentation to manufacture bakery products, which produce carbon dioxide. When we bake any bread or cake, carbon dioxide expands because of the increase in the temperature, and that is why our bread and cakes have a fluffy appearance.

• Application of Charles law in real-life is that Charles law additionally influences the human body as in the late spring season, i.e., summer season; our lungs are loaded up with an enormous volume of air contrasted with the volume present in the lungs in the colder time of year. Therefore, we can efficiently perform physical activities in warm weather.

Charles law application in real life 

According to the application of Charles law, in real-life,states that when the graph between volume and temperature at the constant pressure is plotted, it always gives a straight line known as isobar or isoplestics.

Application of Charles law in real-life upsc notes also state that when mass and pressure, the density of the gas is inversely proportional to its absolute temperature.

Air balloons in sports and meteorological observations are some applications of Charles law in real life.

Conclusion 

The experimental Law known as the Charles Law depends upon an ideal gas’s absolute temperature and volume. Volume changes according to the temperature in both positive and negative manner at constant pressure. In this, pressure remains constant, and by increasing the gas’s temperature, the gas’s volume also increases, and by decreasing the temperature of the gas, volume is also decreasing. This happens because, on increasing the temperature, gas molecules start moving in the random direction with a very high velocity, collisions between the gas molecules take place. As a result, the gas expands and comes out of the container in which it is stored. The pop turkey thermometers work on the application of Charles law. The thermometer is placed in the turkey, and when the temperature increases, the turkey cooks, and the air filled in the thermometer expands to pop in the plunger. An application of Charles law in real life is basketball. When we take a basketball out in winters or cold days, it shrinks a bit as the temperature of the air decreases inside the basketball.