Question

The clouds float in the atmosphere because of their low_______
A. Pressure
B. Velocity
C. Temperature
D. Density

Answer 1

Hint: Clouds are formed of water droplets. The condensed form of water in the atmosphere is due to the low temperature. As we move upwards from the sea level the temperature decreases. At low temperatures the water droplets undergo condensation.

Complete answer:
Every object in this universe has some density. The density of a matter is the ratio of the mass and the volume it occupies in the space. It is denoted by the lowercase Greek letter rho $(\rho )$ .
$\rho =\dfrac{m}{V}$
The clouds have a very less density as they are condensed forms of water. When the density of clouds increases they undergo a reverse process and as a result rain occurs.
As clouds have less density and high volume as compared to the air surrounding them, so the clouds experience a high buoyancy force from the surrounding air, which supports the balance of the weight of the clouds.
The buoyancy force is given by,
$F=V\times g{{\rho }_{air}}$
Where,
$V$ Is the volume
$g$ Is acceleration due to gravity
${{\rho }_{air}}$ Is the density of air
Thus, from the above discussion, it can be noted that the correct answer to fill the black is density.

Therefore, The clouds float in the atmosphere because of their low density. So, the correct option is “Option D”.

Note: Buoyancy is a kind of force that makes an object to float on the other surface. The bouncy is caused by the difference in the pressure applied by the two surfaces. The objects which have less density experience high buoyancy force and make the object float on the medium with high density.