About 22% of the energy used in the U.S. comes from natural gas. There are about 300,000 miles of natural gas pipelines in the lower 48 states and 425,000 gas producing wells. The history of natural gas.
thru-hole. A circuit board packaging technique in which the leads (pins) on discrete components and chips are inserted through holes in the printed circuit board and soldered from beneath.
hole. 1  an opening through something; gap; aperture: a hole in the roof; a hole in my sock. 2  a hollow place in a solid body or mass; a cavity: a hole in the ground. 3  the excavated habitation of an animal; burrow. 4  a small, dingy, or shabby place: I couldn't live in a hole like that. 5  a place of solitary confinement; dungeon.