Related Terms. Common boundary where direct contact between two different cultures, devices, entities, environments, systems, etc., occurs, and where energy, information, and/or material is exchanged. An electrical outlet or a telephone jack a common example of device interface.
Definition. Gas that at ambient temperature and pressure forms a flammable mixture with air at a concentration of 12 percent (or less) by volume.efinition. Gas that at ambient temperature and pressure forms a flammable mixture with air at a concentration of 12 percent (or less) by volume.
Methane is highly flammable (CH4 + [2]O2 = CO2 + [2]H2O). If it leaks out into the air it will generally dissipate and decompose, however if it is confined (as in a house) and reaches levels of about 5 to 15% of the air, it will become explosive; a spark in that house may level it.