However, we have seen that not all aerosols are well-suited for this role. Worse, even among those that are capable, there are still inequalities.
Some only become active at very low temp (around -15°C, for example), while others, more accommodating, can perform their function starting at -3°C.
Some only become active at very low temp (around -15°C, for example), while others, more accommodating, can perform their function starting at -3°C.
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But when things align well, we find ourselves in the presence of a fabulous primary snow crystal.
Credit : Kenneth Libbrecht
Now, I guess the persistence of these droplets might seem completely absurd to you,
Well, actually, no ! Even below 0°C, water droplets will remain liquid.This paradox, which is troubling for our minds, actually corresponds to a particular state of matter called supercooling.
However, since it is an unstable state, the slightest external disturbance (imagine contact with a surface or a particle, for example) will be enough to trigger
As I mentioned, the snow crystal develops by inheriting water molecules that belonged to the neighboring droplets.
In reality, this transfer of water molecules is a natural process called the Bergeron effect.