A hiatal hernia occurs when the upper part of your stomach pushes up through your diaphragm and into your chest region. The diaphragm is a large muscle that lies between your abdomen and chest. You use this muscle to help you breathe. Normally, your stomach is below the diaphragm, but in people with a hiatal hernia, a portion of the stomach pushes up through the muscle. The opening it moves through is called a hiatus. This condition mostly occurs in people who are over 50 years old.
A commodity generally refers to an agricultural product that is bought and sold such as corn, coffee, wheat, etc. Energy commodities include gas, electricity, oil, etc.
A commodity is a basic good used in commerce that is interchangeable with other commodities of the same type. Commonly traded commodities include gold, beef, oil, lumber and natural gas. Additional examples of commodities include iron ore, crude oil, salt, sugar, tea, coffee beans, copper, rice, wheat, silver, and platinum.