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.
Commodities are bulk goods and raw materials, such as grains, metals, livestock, oil, cotton, coffee, sugar, and cocoa, that are used to produce consumer products. The term also describes financial products, such as currency or stock and bond indexes. Commodities are bought and sold on the cash market, and they are traded on the futures exchanges in the form of futures contracts. Commodity prices are driven by supply and demand. When a commodity is plentiful -- tomatoes in August, for example -- prices are comparatively low.