Question

Clouds float in the atmosphere because of their _____?
1. Low Temperature
2. Low Viscosity
3. Low Pressure
4. Low Density

Answer 1

Correct Answer - Option 4 : Low Density

CONCEPT:

• Cloud is a mass of minute water droplets or tiny crystals of ice formed by the condensation of the water vapor in free air at considerable elevations.
• As the clouds are formed at some height over the surface of the earth, they take various shapes.
• According to their height, expanse, density, and transparency or opaqueness clouds are grouped under four types:
  1. cirrus
  2. cumulus
  3. stratus
  4. nimbus.

EXPLANATION:

Clouds have very low density and high volume compared to the air, so they experience high buoyancy force from the surrounding air, to balance their weight.

F_buoyancy =Volume×ρ_{air X} g

so they stay afloat due to buoyancy force from the surrounding air.