Due to construction and functional characteristics above described, with the internal reflux column it is possible to get selective the separation of components of extremely complex mixtures, with similar chemico-physical characteristics, not economically separable otherwise.
Uniform numbers in American football are unusual compared to those in other sports. They are displayed in more locations on the uniform; they are universally worn on both the front and back of the jersey; and in many cases TV numbers are displayed on either the jersey sleeves, the shoulder pad, or occasionally on the helmets.
Field players always wear shorts made of lightweight material with an elastic waist. FIFA regulations allow for an extra pair of shorts under the main shorts as long as they are the same color. One-piece suits are not allowed in soccer. A player's number is often printed on the shorts, but not always.