The best reason I can think of for why we believe that air is a mixture is that freezing air slowly yields different liquids at different temperatures. Liquid nitrogen has a different boiling point than liquid oxygen. They also freeze at different temperatures.
An inguinal hernia is a protrusion of abdominal-cavity contents through the inguinal canal. Symptoms are present in about 66% of affected people. This may include pain or discomfort especially with coughing, exercise, or bowel movements. Often it gets worse throughout the day and improves when lying down.
Inguinal hernias can be indirect or direct, incarcerated, or strangulated. Indirect inguinal hernia. An indirect inguinal hernia is the most common type. It often occurs in premature births, before the inguinal canal becomes closed off. However, this type of hernia can occur at any time during your life. This condition is most common in males. Direct inguinal hernia. A direct inguinal hernia most often occurs in adults as they age. The popular belief is that weakening muscles during adulthood lead to a direct inguinal hernia.