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.
Consequently, natural gas will always rise when there is a leak. The standard for natural gas indoor installations is the NBN D51-003 standard. Propane gas is stored at the location where it is used. This is in a liquid form in a storage receptacle (a tank or bottle). This ensures that propane gas is available everywhere even when there is no natural gas network. A storage receptacle is not required for natural gas, just a connection to the natural gas network.