Những hiện tượng thiên nhiên lạ lùng chỉ xảy ra khi trời lạnh

Những hiện tượng thiên nhiên lạ lùng chỉ xảy ra khi trời lạnh


Thời tiết lạnh giá gây ảnh hưởng tới nhiều người nhưng nó cũng là nguyên nhân tạo ra các hiện tượng thiên nhiên kì thú trên Trái đất.


Mùa đông với cái rét ngọt có thể khiến nhiều người cảm thấy thích thú vì có thể ôm gấu tung tăng khắp nơi nhưng khi nhiệt độ thời tiết xuống quá thấp, nhiều người sẽ phải bất ngờ khi các hiện tượng thiên nhiên kỳ quái này xảy ra đấy!

1. Bong bóng băng

Những hiện tượng thiên nhiên lạ lùng chỉ xảy ra khi trời lạnh
Nghe có phần cổ tích nhưng khi nhiệt độ xuống dưới âm 11 độ C, chúng ta có thể khiến bong bóng đóng băng.

Bí quyết để tạo ra bong bóng băng chính là thổi bóng vào không trung để chúng có thời gian đóng băng trước khi chạm tới mặt đất hoặc vỡ vụn. Bề mặt của bong bóng sẽ hình thành các mô tinh thể, trông hơi giống vỏ trứng bị nứt.

2. Sóng biển đóng băng

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Bạn cho rằng sóng biển thì không thể đóng băng ư? Không, bạn nhầm rồi đó.

Bởi nước mặn cũng có thể đóng băng như nước ngọt nhưng ở nhiệt độ thấp hơn. Nhiệt độ đóng băng của nước biển vào khoảng -2.2 độ C. Những gợn sóng khi đóng băng sẽ đặc sệt, di chuyển chầm chậm 1 cách kỳ lạ.

3. Bánh băng tuyết

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Đây được coi là 1 trong những hiện tượng tự nhiên hiếm gặp – “bánh băng tuyết”. Những chiếc “bánh” này to gần bằng chiếc đĩa ăn, xuất hiện khi các tinh thể tuyết trong nước nằm cách xa bờ.

Lúc này sẽ không còn những con sóng lăn chúng thành hình cầu nữa, thay vào đó chúng sẽ nổi dập dềnh và bồi tụ dần tạo thành những phiến mỏng dẹt.

4. Nước sôi biến thành tuyết

nuoc soi bien thanh tuyet
Không khí lạnh vốn rất nặng, nó đồng nghĩa với việc các phân tử gần nhau hơn và chỉ còn lại rất ít khoảng trống cho phân tử nước bốc hơi.

Khi nước nóng được “hất” ra, bầu không khí lạnh, khô sẽ ngăn không cho các phân tử nước liên kết như ban đầu. Lúc này, các kết tủa hơi sẽ bám vào hạt nhỏ trong không khí như Natri hoặc canxi, hình thành tinh thể tuyết như chúng ta thấy.

5. Quầng Mặt trời

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Hiện tượng quầng Mặt trời – Sun halo – xuất hiện khi ánh sáng Mặt trời trên cao đi qua các tinh thể băng trong không khí.

Tuy nhiên, theo nghiên cứu từ ĐH Illinois (Mỹ), các hạt tinh thể phải có hình lục giác với đường kính nhỏ hơn 20,5 micromet, đồng thời góc độ chiếu sáng phải là 22 độ. Hình dạng và kích thước này cho phép ánh sáng khúc xạ 2 lần, giúp quầng Mặt trời được hình thành.

6. Tuyết cuộn hình ống

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Đây là hiện tượng lạ, chỉ xảy ra khi có sự kết hợp giữa điều kiện nhiệt độ, độ ẩm, tốc độ gió, địa hình thoai thoải sườn dốc.

Theo các chuyên gia, cuộn tuyết hình thành ở vùng sườn đồi, bề mặt bao phủ bởi 1 lớp băng nhẵn hay tuyết cứng. Tuyết sẽ rơi xuống, chất đống trên mặt đất. Các cục tuyết sẽ lăn dần xuống dốc, dốc càng dài thì đường kính cục tuyết sẽ càng to.


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