Also, since oxygen has a higher electronegativity than hydrogen, the charge difference makes it a polar molecule.

It dissolves very well in water because water also acts like a polar molecule.

This highly polar molecule has the largest known internal electric field.

As a result, water is a polar molecule with an electrical dipole moment.

Only volatile polar molecules can enter and exit the membrane pores.

Water is also a polar molecule which means, in certain cases, it can bind to the denatured proteins.

That happens because the forces that hold non polar molecules together are mostly weak.

It is used by most cells, because many critical substances are large polar molecules that cannot pass through the cell membrane.

Water is a polar molecule, but H2 and O2 are non-polar.

The second chemical fact is that polar molecules are less volatile than nonpolar ones.