Physics
Clouds float in the atmosphere because of their

Low viscosity
Low density
Low temperature
Low pressure

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Physics
Inside an aeroplane, flying at a high altitude,

normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.
the pressure is the same as that outside.
normal humidity and partial vacuum are maintained.

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the least surface area for a given volume
Intermolecular forces are strong in liquids
Inter molecular forces are weak in liquids
A sphere has the largest surface area for a given volume

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