Answer:
When the partially positive end of one water molecule is attracted to the partially negative end of another water molecule
Explanation:
Water is made of [tex]H_{2} O[/tex]. The polar molecules H and O forms the hydrogen bond.
A hydrogen bond exists as an inter molecular force (IMF) that forms a certain kind of dipole-dipole attraction when a hydrogen atom bonded to a strongly electronegative atom lives in the vicinity of another electronegative atom with a lone pair of electrons. Inter molecular forces (IMFs) happen between molecules.
The  partial negative charge on  oxygen  attracts the positively charged H+  forming the hydrogen bonds. In the case of water, hydrogen bonds are  formed between the neighboring hydrogen and oxygen atoms of  the adjacent water molecules. This hydrogen bonds are responsible for the liquid state of water.
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