13 Faits Sur La Neige Qui Vous Donneront Des Frissons

Sympa

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Transcript

00:00Throw a snowball at your friends, put a carrot on your snowman, skate, and many other things.

00:06Here is the spirit of winter.

00:08And some little information about snow.

00:10You will be surprised to learn that snow can be of different colors.

00:14Let's start with yellow snow.

00:15If it starts to snow while the flowers are already in full bloom, then there is pollen in the air.

00:21In addition to giving you allergies, it settles on snowy surfaces.

00:26In this case, the snow mixes with the pollen, which gives it this funny yellowish hue.

00:31Snow clouds can also carry particles of sand.

00:35Yellowish snow was observed in South Korea in March 2006.

00:39Snow transported from the sand coming from the deserts of northern China.

00:43Pollen is often harmless, but the yellowish snow caused by the sand is not so innocent.

00:49It is linked to atmospheric pollution.

00:51When the NASA's Aura satellite detected this phenomenon,

00:55meteorological authorities warned the public against the potential risks of this golden snow.

01:02Sometimes, the color of the snow is closer to brown than yellow.

01:05Some trees, such as oak trees, have a rich tannin bark.

01:09It is an organic compound that protects only the tree against bacteria and harmful fungi.

01:15These tannins can fall to the ground near the tree.

01:18To do this, it must first rain, then the rain turns into snow.

01:22Humidity makes the tannins flow.

01:25Have you ever lied down in the snow and opened your mouth to let tiny flakes in?

01:31But to what extent can we eat these flakes safely?

01:35In most cases, you should not do it.

01:38But here is a tip for snow eaters.

01:40The safest way to consume snow is to choose a clean and white layer.

01:45Pick it up on the top, which is fresh and flaky.

01:48But it is better to avoid.

01:49We never know what the snow found in the street can contain.

01:54Then we have bluish snow.

01:56When there are clouds, the shadows are darker.

01:59The snow absorbs all the spectrum of colors.

02:02Finally, almost all the spectrum.

02:04It cannot absorb completely blue.

02:06Bluish snow is formed due to weather conditions.

02:09Snow flakes are translucent because they are made up of ice crystals.

02:14These crystals reflect light.

02:17This is why, in most cases, the snow seems white to you.

02:23Gray snow and black snow also exist.

02:26And I am not talking about the melted snow mixed with dirt near roads.

02:30I am talking about the one created with volcanic dust.

02:33Or with ash, ashes or exhaust gases.

02:37This type of snow is dirty.

02:38It can have a dusty or oily smell.

02:41If its color comes from petrochemical products, it is probably toxic.

02:48There is also watermelon snow.

02:50Its name comes from its red and green color.

02:53Unlike other colored versions, it has a sweet and fruity scent.

02:58Different types of algae and bacteria are at the origin of watermelon snow.

03:02But you have to be lucky to see it.

03:04Because it appears only in the alpine regions and on the polar coasts in summer.

03:09Green is due to chlorophyll.

03:12And red to astaxanthin.

03:14It is a kind of pigment.

03:16Fun fact, some animals, like pink flamingos, crabs and salmon,

03:21also draw their color from this pigment.

03:24This phenomenon is very important from an ecological point of view.

03:27When snow melts, it mixes with water and becomes a source of food for living beings.

03:34Snow can come in different colors, but also in different shapes.

03:40Snowballs are an example.

03:42For me, it's like someone dragging an ice cube on the ground.

03:47It's a rare phenomenon.

03:49It takes certain conditions for it to appear.

03:51There must be wind, but not too much.

03:54In general, 50 km per hour is enough.

03:57But it also depends on the snow.

03:59It must snow, and the power of snowfalls is another question.

04:05Snowballs appear in the meadows or on the slopes of the hills,

04:09where there are no rocks or trees.

04:11They are made up of two distinct layers of snow.

04:14The first is the pre-existing layer that has settled on the ground.

04:18The second is a fresh layer.

04:21Imagine the snow that would drizzle from a roller coaster without being able to cling to its surface.

04:27The wind then carries enough sticky snow to adhere to what is on its way.

04:32As the roller progresses, it thickens.

04:35Of course, there must be wind, and the ground must be in slopes.

04:40I would now like to address other interesting facts about snow.

04:43For example, its silence.

04:46Have you noticed that freshly fallen snow absorbs noises?

04:50Especially if you live in an animated city, you will realize that the atmosphere is calmer.

04:56It absorbs sound waves.

04:58It is like a sound absorption technology.

05:01But everything changes when it melts and then freezes.

05:04Ice reverberates sound waves.

05:07The sound then spreads further, and it is clearer.

05:14We are not the only ones who appreciate snow.

05:17Apparently, some species of monkeys also love it.

05:22Japanese macaques, or snow monkeys, also make snowballs to have fun.

05:27Young macaques are particularly attracted to snow.

05:31They mutually steal their snowballs, then fight to get them back.

05:38Snow, Blizzard, what else?

05:40I can count a few words related to snow, but the Inuit, for example, have dozens.

05:45And the Scottish have 421 terms associated with snow.

05:49For example, Skelf is a big snowflake, and Unbrack means the beginning of thawing.

05:56On one side, there is the cold and the risk of hypothermia.

06:00On the other, there are terriers and human igloos.

06:03We associate snow with cold, but it can warm us up.

06:07As snow is composed of more than 90% trapped air, it is an excellent insulator.

06:14We have talked about snow itself, but what about snowflakes?

06:19The shape of a snowflake is related to the temperature of the air.

06:23Researchers have examined snowflakes and discovered that long and thin ice crystals,

06:27like needles, are formed at about 2 ° C.

06:31They examined other samples of crystals taken at different temperatures.

06:36Snowflakes are flat like plates at low temperatures, about minus 5 ° C.

06:42Snowflakes can also have 6 branches or a dendritic structure.

06:48It also depends on the changes in the temperature of the surrounding air.

06:52You may have heard that there are no two identical snowflakes.

06:56A catalog of snowflakes confirms this theory.

07:00A chemistry professor has detected more than 30 different types of snowflakes.

07:04They are classified as follows, in columns, flat, ringed, irregular, etc.

07:09The reason for this great variety is the path that each snowflake takes to land.

07:15They are all faced with slightly different atmospheric conditions.

07:19They always have 6 sides, that's for sure.

07:23In 1988, a scientist found two identical snowflakes.

07:27Marvelous!

07:29Snow is also present in the deserts.

07:32I know it seems very contradictory.

07:35We are used to thinking of hot sand, cacti and nothingness when we talk about deserts.

07:41In the Valley of Death or the Sahara, we sometimes see snow.

07:45In fact, in January 2022, some parts of the Sahara Desert were covered with a white cover.

07:51It is unlikely that this happens often, but it is not impossible at all.

07:56Indeed, some nights, the temperatures in the desert are very low.

08:00Snow needs two things to form, cold temperatures and humid air.

08:05The phenomenon is therefore rather rare.

08:10A bonus, what is the record of the tallest snowman?

08:13In 2008, the inhabitants of the city of Bethal, in the United States,

08:17joined forces with those of the inhabitants of the neighboring cities to beat the world record.

08:22Their snowman measured 37 meters high.

08:25It took them more than a month to achieve it.

08:28The Statue of Liberty only measures a few centimeters more.

08:35When we see a strong snowstorm, we talk about Blizzard.

08:40But this is not always accurate.

08:42Indeed, a snowstorm must meet certain conditions to be qualified as Blizzard.

08:46For example, the wind must blow at least 55 km per hour.

08:51In addition, the snow must reduce visibility for at least 3 hours.

08:56Without this, we will rather talk about stormy storms or snowstorms.

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