compressed natural gas (fuel) (CNG)

highly compressed (gas)

compressed air pistol

compressed-paper wad (of ammunition)

compressed air starter

compressed digital raster graphics

natural and man-made

natural concealment

natural disaster

natural features

natural forward position

natural obstacle

natural respiratory pause

natural background radiation

natural dangerous factors

develop a natural obstacle

surveillance by natural vision

gas gun; (tear) gas launcher

fuel gas

gas / electric hybrid (fuel)

Proton Exchange Membrane Fuel Cell (PEM fuel cell, PEMFC)

blister agent/ gas

blood gas

choking agent / gas

combustion gas

gas alarm / warning

gas analysis system

gas and electricity service

gas bleed

gas chamber

gas defense

gas density

gas mask