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.
Commodity money is a form of money with an intrinsic value. Some of the best examples of commodity money are silver and gold coins. Currency(cash) or banknotes do not have intrinsic value and are virtually worthless in itself. It only has value because society views it as a unit of exchange. This type of currency is called fiat money.