Question

Use of hot air balloons in sports and meteorological observations is an application of
A. Boyle's law
B. Newton’s law
C. Kelvins law
D. Charles law

Answer 1

Hot air is very lighter than the normal. The reason behind the light weight of the hot air is that when we heated the air the moisture which is present in air will be dried then automatically the weight of the hot air will be lesser than the weight of the normal air.

Complete answer:
- In the question it is asked according to which law the hot air which is present in the balloons be light in weight then the normal air will.
- We know that pressure is inversely proportional to the volume of the gas.
- As the pressure increases the volume of the gas decreases.
- In the case of the hot air balloons the weight of the hot air is less so automatically the hot air balloons will move to very heights easily.
- Therefore the law which is going to be applicable in the concept of hot air in balloons in meteorological observations and in sports is Boyle's law.
- As per Boyle's law pressure is inversely proportional to volume of the gas.
$P\propto \dfrac{1}{V}$
Here P = pressure of the gas
V = Volume of the gas.
Therefore, use of hot air balloons in sports and meteorological observations is an application of Boyle’s law. So, option (B) is correct.

Note:
As we are moving away from the earth means into the sky the pressure decreases therefore the volume increases. So Boyle’s law is going to be applicable in the case of hot air balloons which are going to be used in sports and meteorological observations.