Why icebergs swim in the sea?

Most substances, including liquids, are compressed during cooling. Water is unique in that it compresses only to a certain temperature, namely to -4 ° С. If the temperature is lower, water begins to expand, as violations of individual bonds between hydrogen atoms. It is so expanding that the ice that was formed is somewhat lighter than water. That's why icebergs swim, but 9/10 of the iceberg is under water. Because of this, ice blocks often pose a great danger to the ships.

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