In other words, you use a type of fuel air explosive that's in placed by hand, or you can use a bomb dropped from an aircraft.
From the edition.cnn.com
A tank of liquid hydrocarbon fuel is also hazardous, but to explode like a bomb its contents must be mixed with a large volume of air.
From the guardian.co.uk
In that case, Higgins identified the weapon in the video as a Russian-made thermobaric bomb, commonly known as a fuel-air bomb.
From the sacbee.com
An Afghan policeman walks past a burned out fuel truck after being targeted by a bomb, near Bagram air base, north of Kabul, on Oct. 26, 2011.
From the theepochtimes.com
Libya's abundant stocks of the Czech-made explosive Semtex appears set to fuel a new wave of suicide bomb attacks while looted surface-to-air missile systems jeopardise air travel in the area.