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.
What is an inguinal hernia? An inguinal hernia happens when organs or abdominal tissue push through a weak spot in the abdominal wall. The abdominal wall is made of fat and muscle. It holds the intestines in place. The hernia may contain fluid, tissue from the abdomen, or part of an organ (such as an intestine).