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. Inguinal hernias occur in the groin area and are typically the result of a muscle opening left due to incomplete development of the muscle before birth. An inguinal hernia, which appears as a bulge in the groin area, can develop gradually or all at once, often after lifting a heavy weight.