a snowflake falling !?

Question

How long does it take to hit the ground ??

Answer 1

It's hard to say, because snow can fall from clouds at a wide range of heights. What I can tell you, though, is that snow is falling from high enough that it reaches its terminal velocity, where air resistance balances gravity. So by the time it hits the ground, it's no longer accelerating like an object that you drop from your hand. The terminal velocity depends on the qualities of the snowflakes. In very cold weather, snow doesn't take the familar hexagonal flake shape. Instead, it forms solid ice crystals. This type of snow probably has the highest terminal velocity. In borderline freezing temperatures, snow is "wet," and clumps together. This snow would have a lower terminal velocity than the solid crystals, but less than true snowflakes, which have the most surface area relative to their mass and therefore the most air resistance and the lowest terminal velocity.

Answer 2

Twice half its length. Depends on how high in the atmosphere the snowflake formed: Atmospheric pressure - falls faster in low pressure because of wind resistance; Size of snowflake - large snowflakes have higher wind resistance because of hexagonal crystal structure. etc etc etc