The ,micrometre, (international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equalling 1 × 10 −6 metre (SI standard prefix "micro-" = 10 −6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).
Horizontal and ,directional drilling, techniques make it possible to produce more ,natural gas, from a single well than in the past, so fewer wells are necessary to develop a ,natural gas, field. Hydraulic fracturing (commonly called hydrofracking, fracking, or fracing ) of shale, sandstone, and carbonate rock formations is opening up large reserves of ,natural gas, that were previously too expensive ...