There are two types of gas used in commercial ranges, natural gas and propane, or LP.
Weighing less than air and dispersing upward, natural gas comes to a range from a pipeline. The gas and electric company normally supplies natural gas. It comes into the building through a pipeline.
Also called LP, liquid propane weighs more than air and remains down on the floor with a gas leak. Propane is supplied to a building through a pipeline that leads to a propane tank on the property. This tank will need to be refilled.