The famous scientist albert einstein sometimes used "thought experiments" such as imagining himself chasing a beam of light or riding in an elevator in free-fall. these thought experiments, which would not be possible to conduct physically, him challenge current scientific thinking and develop his theories of gravity and of special relativity.

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.