Question

Which of the following principles shows that if you increase air speed its pressure will decrease?
A. Darwin principle
B. Einstein principle
C. Bohr principle
D. Bernoulli’s principle

Answer 1

Hint: As in our earth, air is composed of several different gases like primary nitrogen than oxygen and carbon dioxide and many more, thus the speed of the air depends upon the temperature of the environment and at different altitudes of earth its pressure and speed are different.

Complete answer:
Air is considered as a fluid because it flows and it also takes different shapes while moving through different regions. And by assuming air as a fluid Bernoulli discovered that the fluid which moves faster creates small pressure in the region and while when it moves slower it creates a high pressure in the region, and this principle is also valid for all fluids.

Hence, its Bernoulli principle which states that “For a fluid moving with high speed creates a low pressure in its region whereas a fluid which moves with slower speed creates a high pressure in its region”.So, if the speed of air increases its pressure will get reduced, governed by Bernoulli's principle.

Hence, the correct option is D.

Note: It should be remembered that, the speed of air is higher at high temperature due to high thermal energy causes the molecules of gases to speed up results in low pressure of air while the regions where temperature is too cold then speed of air will be low and results in higher pressure of the air. The composition of nitrogen gas is highest in our environment which is around 72%.