Xxi
@locuste.bsky.social
Scientific popularization, but not only.
Posts in French and English.
Posts in French and English.
Bientôt, y en aura plus.
November 26, 2024 at 8:34 PM
Bientôt, y en aura plus.
Merci, on va essayer de toucher un public international, maintenant. 😅
Je compte postuler dans un feed prochainement.
Je compte postuler dans un feed prochainement.
November 26, 2024 at 8:33 PM
Merci, on va essayer de toucher un public international, maintenant. 😅
Je compte postuler dans un feed prochainement.
Je compte postuler dans un feed prochainement.
Poke (How does snow form ?)
@drbarriere.bsky.social @lionelcase.bsky.social @corinnedepagne.bsky.social
@drbarriere.bsky.social @lionelcase.bsky.social @corinnedepagne.bsky.social
November 26, 2024 at 8:32 PM
Poke (How does snow form ?)
@drbarriere.bsky.social @lionelcase.bsky.social @corinnedepagne.bsky.social
@drbarriere.bsky.social @lionelcase.bsky.social @corinnedepagne.bsky.social
Poke (How does snow form ?)
@chatsecouriste.bsky.social @saiyanbio.bsky.social @ericbilly.bsky.social @duxpacis.bsky.social @astropierre.com @lethiecv.bsky.social @ledoc.bsky.social @nopeneverhope.bsky.social @tipuncho.bsky.social @sonicurticant.bsky.social @mathieumolimard.bsky.social
@chatsecouriste.bsky.social @saiyanbio.bsky.social @ericbilly.bsky.social @duxpacis.bsky.social @astropierre.com @lethiecv.bsky.social @ledoc.bsky.social @nopeneverhope.bsky.social @tipuncho.bsky.social @sonicurticant.bsky.social @mathieumolimard.bsky.social
November 26, 2024 at 8:31 PM
That’s it, we’ve reached the end of this thread! If you enjoyed it, don’t forget to repost and like, and subscribe to stay updated with my future content. Thanks for your support and see you soon !
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Insightful Existence (@insightful_existence) • Threads, Say more
5 Followers • 0 Threads • Scientific popularization, but not only.
Posts in French and English. See the latest conversations with @insightful_existence.
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November 26, 2024 at 8:26 PM
That’s it, we’ve reached the end of this thread! If you enjoyed it, don’t forget to repost and like, and subscribe to stay updated with my future content. Thanks for your support and see you soon !
(Feel free to also follow my Threads account if you're interested : www.threads.net/@insightful_...)
(Feel free to also follow my Threads account if you're interested : www.threads.net/@insightful_...)
2- The air layer is sufficiently thickThis time, as you might have guessed, the droplets become solid again, taking the form of ice pellets.
November 26, 2024 at 8:18 PM
2- The air layer is sufficiently thickThis time, as you might have guessed, the droplets become solid again, taking the form of ice pellets.
This is the famous - and no less formidable - freezing rain !
November 26, 2024 at 8:17 PM
This is the famous - and no less formidable - freezing rain !
1- The air layer is too thin.Under these conditions, the droplets do not have enough time to return to the solid state; however, they become supercooled, which will eventually allow them to freeze upon contact with the ground (or other surfaces).
November 26, 2024 at 8:17 PM
1- The air layer is too thin.Under these conditions, the droplets do not have enough time to return to the solid state; however, they become supercooled, which will eventually allow them to freeze upon contact with the ground (or other surfaces).
But sometimes, they encounter a cold air layer again, just before landing!In this scenario, two outcomes are possible…
November 26, 2024 at 8:16 PM
But sometimes, they encounter a cold air layer again, just before landing!In this scenario, two outcomes are possible…
Of course, if they only pass through warm layers, the question doesn’t even arise: they will remain liquid until they reach the ground, and we will have to deal with regular rain…
November 26, 2024 at 8:16 PM
Of course, if they only pass through warm layers, the question doesn’t even arise: they will remain liquid until they reach the ground, and we will have to deal with regular rain…
Even though there is no longer any hope for the snow to return at this stage, we still don’t know what will happen to the droplets that result from it, as they now have to pass through the remaining air layers before reaching us…
November 26, 2024 at 8:16 PM
Even though there is no longer any hope for the snow to return at this stage, we still don’t know what will happen to the droplets that result from it, as they now have to pass through the remaining air layers before reaching us…
But if unfortunately, the snowflakes are exposed to warm temperatures (I mean temperatures significantly above 0°C), it’s a disaster: they melt!We then get ordinary raindrops…
November 26, 2024 at 8:15 PM
But if unfortunately, the snowflakes are exposed to warm temperatures (I mean temperatures significantly above 0°C), it’s a disaster: they melt!We then get ordinary raindrops…
They will then settle in successive layers on the ground, ultimately offering us a divine snowy blanket!
(It should be noted that the colder it is, the more likely we are to find dry snow. Conversely, temperatures closer to 0°C favor the appearance of wet or even slushy snow.)
(It should be noted that the colder it is, the more likely we are to find dry snow. Conversely, temperatures closer to 0°C favor the appearance of wet or even slushy snow.)
November 26, 2024 at 8:15 PM
They will then settle in successive layers on the ground, ultimately offering us a divine snowy blanket!
(It should be noted that the colder it is, the more likely we are to find dry snow. Conversely, temperatures closer to 0°C favor the appearance of wet or even slushy snow.)
(It should be noted that the colder it is, the more likely we are to find dry snow. Conversely, temperatures closer to 0°C favor the appearance of wet or even slushy snow.)
If all these layers are cold (in other words, if it is below 0°C, or, in the worst case, just a little above), the snowflakes will be preserved.
November 26, 2024 at 8:14 PM
If all these layers are cold (in other words, if it is below 0°C, or, in the worst case, just a little above), the snowflakes will be preserved.
Unfortunately, it should be noted that at this stage, there is still no guarantee that they will reach us in this form: everything will depend on the temperature of the air layers they have yet to cross…
November 26, 2024 at 8:13 PM
Unfortunately, it should be noted that at this stage, there is still no guarantee that they will reach us in this form: everything will depend on the temperature of the air layers they have yet to cross…
More or less large, but always intertwined, these different clusters constitute what we call snowflakes!
Their fall is truly a magical spectacle…
Their fall is truly a magical spectacle…
snowflakes falling on a blue background with a gradient
ALT: snowflakes falling on a blue background with a gradient
media.tenor.com
November 26, 2024 at 8:13 PM
More or less large, but always intertwined, these different clusters constitute what we call snowflakes!
Their fall is truly a magical spectacle…
Their fall is truly a magical spectacle…
That said, since they all share the common trait of being subjected to whimsical paths, collisions between them quickly multiply, which either breaks them apart or interlocks them with each other.It is therefore possible to see clusters of snow crystals forming all over the sky.
November 26, 2024 at 8:11 PM
That said, since they all share the common trait of being subjected to whimsical paths, collisions between them quickly multiply, which either breaks them apart or interlocks them with each other.It is therefore possible to see clusters of snow crystals forming all over the sky.
These random movements generate collisions with other snow crystals… At this moment, there are millions of them in the sky, each more beautiful than the other. All different too; as if each had its own identity. To be honest, I never get tired of admiring them…
November 26, 2024 at 8:11 PM
These random movements generate collisions with other snow crystals… At this moment, there are millions of them in the sky, each more beautiful than the other. All different too; as if each had its own identity. To be honest, I never get tired of admiring them…
and falls to the ground…There, subjected to air turbulence, it does not descend in a straight line, but actually follows a capricious trajectory, punctuated by deviations and sudden jolts.
November 26, 2024 at 8:10 PM
and falls to the ground…There, subjected to air turbulence, it does not descend in a straight line, but actually follows a capricious trajectory, punctuated by deviations and sudden jolts.
I say almost, because don’t forget about the supercooled droplets! In case of a shock or even slight contact, which sometimes happens, they can also solidify on the crystal, increasing its volume.
If the crystal finds good quantities of them in its vicinity, it eventually becomes too heavy
If the crystal finds good quantities of them in its vicinity, it eventually becomes too heavy
November 26, 2024 at 8:10 PM
I say almost, because don’t forget about the supercooled droplets! In case of a shock or even slight contact, which sometimes happens, they can also solidify on the crystal, increasing its volume.
If the crystal finds good quantities of them in its vicinity, it eventually becomes too heavy
If the crystal finds good quantities of them in its vicinity, it eventually becomes too heavy
it readily deposits on the protruding corners of the crystal, which are the most accessible).
As you can see, water vapor plays a central role, not only in the formation but also in the development of the snow crystal. Almost everything depends on it.
As you can see, water vapor plays a central role, not only in the formation but also in the development of the snow crystal. Almost everything depends on it.
November 26, 2024 at 8:09 PM
it readily deposits on the protruding corners of the crystal, which are the most accessible).
As you can see, water vapor plays a central role, not only in the formation but also in the development of the snow crystal. Almost everything depends on it.
As you can see, water vapor plays a central role, not only in the formation but also in the development of the snow crystal. Almost everything depends on it.
It is triggered spontaneously due to the difference in humidity between the air around the crystal and that in the droplet zone.
Once in action, it induces the gradual evaporation of the droplets, and the water vapor thus formed joins the crystal, freezing onto it in turn (it should be noted that
Once in action, it induces the gradual evaporation of the droplets, and the water vapor thus formed joins the crystal, freezing onto it in turn (it should be noted that
November 26, 2024 at 8:09 PM
It is triggered spontaneously due to the difference in humidity between the air around the crystal and that in the droplet zone.
Once in action, it induces the gradual evaporation of the droplets, and the water vapor thus formed joins the crystal, freezing onto it in turn (it should be noted that
Once in action, it induces the gradual evaporation of the droplets, and the water vapor thus formed joins the crystal, freezing onto it in turn (it should be noted that
So, if necessary, I prefer to warn you against the temptation to attribute any will to the snow crystal: no, I assure you, it is not consciously stealing the droplets to grow at their expense!
In reality, this transfer of water molecules is a natural process called the Bergeron effect.
In reality, this transfer of water molecules is a natural process called the Bergeron effect.
November 26, 2024 at 8:08 PM
So, if necessary, I prefer to warn you against the temptation to attribute any will to the snow crystal: no, I assure you, it is not consciously stealing the droplets to grow at their expense!
In reality, this transfer of water molecules is a natural process called the Bergeron effect.
In reality, this transfer of water molecules is a natural process called the Bergeron effect.
their immediate transition to the solid state. We will see later examples of situations that cause this sudden change, but for now, let’s continue with my story.
As I mentioned, the snow crystal develops by inheriting water molecules that belonged to the neighboring droplets.
As I mentioned, the snow crystal develops by inheriting water molecules that belonged to the neighboring droplets.
November 26, 2024 at 8:07 PM
their immediate transition to the solid state. We will see later examples of situations that cause this sudden change, but for now, let’s continue with my story.
As I mentioned, the snow crystal develops by inheriting water molecules that belonged to the neighboring droplets.
As I mentioned, the snow crystal develops by inheriting water molecules that belonged to the neighboring droplets.