A rough analogy is when the oil in your car's engine is dirty and needs changing, it gets blackened, thick and sludgy. Thickened bile can't flow well. Since your intestines REQUIRE bile to stimulate movement, poor bile flow causes lack of peristalsis, which equals constipation.
A water molecule measure approximately 2.75 angstroms, making it one of the smallest of all molecules. One meter is 10 billion angstroms. The water molecule is shaped like a V, with two atoms of hydrogen extending at an angle of around 104 degrees from an atom of oxygen. Continue Reading.
This gives a mean free path for air molecules in these conditions of 2x10 -7 m or 200 nm, about a thousand molecular diameters. Each molecule makes about five thousand million collisions per second! At an altitude of 100 km the mean free path is 1 metre and at 300 km it is nearly 10 km.