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.
However, use-value does not automatically lead to a commodity: He who satisfies his own need with the product of his own labour admittedly creates use-values, but not commodities. In order to produce the latter, he must not only produce use-values, but use-values for others, social use-values (131). Commodities, therefore, possess a double form, i.e. natural form and value form (138). (See Use-Value vs. Exchange-Value.) The physical body of the commodity is made up of 1) the material provided by nature (e.g. linen, gold, etc.); and 2) the labor expended to create it (see Marx, Capital 133). Note that a commodity can refer to tangilble things as well as more ephemeral products (e.g. a lecture).