Morphea is a localized or limited form of scleroderma, a condition that can cause a wide variety of problems, from skin discoloration to difficulty with the function of joints and muscles and other connective tissues. Morphea typically appears on your abdomen, chest or back, but it can affect your face, arms and legs.
There are 27.7 inches of water column (wc) pressure in 1 PSI of pressure. So 7wc is about 1/4 PSI. This is the normal pressure that household natural gas is delivered. The normal delivery on propane (LP), for household use is 11wc or a little more than 1/3 PSI. Both of these pressures are the result of the regulators on the gas line. In the case of natural gas, the meter acts as a measure of volume (so you can get a bill) and as a regulator.
Propane is a gas that can be turned into a liquid at a moderate pressure, 160 pounds per square inch (psi), and is stored in pressure tanks at about 200 psi at 100 degrees Fahrenheit. When propane is drawn from a tank, it changes to a gas before it is burned in an engine. Propane has been used as a transportation fuel since 1912 and is the third most commonly used fuel in the United States, behind gasoline and diesel. More than four million vehicles fueled by propane are in use around the world in light-, medium-, and heavy-duty applications.