hàng thhuws 5 dưới lên

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vậy bn chơi giải đố vs mik ko

mik cx đang chán

xin k

nhớ k

HT

đường đời dài nhất

đường biển thôi vào google maps

xem đi đường biển dài nhất

vì nó không bao giờ kết thúc

biển là nước nha

Cái áo nha bn

@Mina

cái áo nhá

hom qua , hom nay , ngay mai

Hôm nay, hôm qua, ngày mai, hôm trước nha baby:3

cuc than

cục than nha 

hok tốt 

Báo không cong   \(\Leftrightarrow\)Bóng không cao   \(\Leftrightarrow\)Bóng lùn    \(\Leftrightarrow\)Bún lòng

# Kukad'z Lee'z

bà ăn bún lòng nhé

phong thu ba

Phòng thứ 3

Vì nó chứa khí heli

@Nghệ Mạt

#cua

TL:

Khi ta bơm một quả bóng với một loại khí có tên là hydro, nó sẽ bay được trong không khí. Đơn giản là vì hydro nhẹ hơn không khí. Do vậy, quả bóng có thể bay lên được, giống hệt như một bong bóng khí trong nước vậy.

Hydro nằm trong quả bóng có một trọng lượng nhất định. Song nó lại có trọng lượng riêng ít hơn của không khí.

Điều đó nghĩa là quả bóng chứa hydro sẽ nhẹ hơn khi nó chứa không khí, vì thế mà nó bay lên được.

Khí hydro hình thành từ các phân tử nhỏ và nhẹ hơn tất cả các phân tử khác có trong không khí. Do vậy, hydro thật là lý tưởng cho việc bơm căng các quả bóng bay, song cũng thật nguy hiểm: đó là một loại khí dễ nổ. Vì thế người ta thích sử dụng khí heli hơn, một loại khí nặng hơn một chút mà lại không nguy hiểm.

Người ta cũng có thể bơm các quả bóng bay bằng khí nóng, vì khí nóng nhẹ hơn khí lạnh: do vậy mà khí cầu được sinh ra.

_HT_

c la bong cua con voi

A     BÍ MẬT

B     NƯỚC

C     CÁI BÓNG CỦA CON VOI

D      6 ngày đầu ốc sên sẽ leo được 6m, vậy thì đến chiều ngày chủ nhật ốc sên sẽ leo được đến đỉnh

ĐỐ J KHÓ HƠN ĐI

CHO MIK XIN K