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.
Noun. 1. pothole-a pit or hole produced by wear or weathering (especially in a road surface). chuckhole.hollow, hole-a depression hollowed out of solid matter.. A hole or pit, especially one in a road surface. Also called chuckhole. 2. A deep round hole worn in rock by loose stones whirling in strong rapids or waterfalls. 3. Western US A place filled with mud or quicksand that is a hazard to cattle.