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The result is a powerful blast followed by a partial vacuum as oxygen is sucked from the air as the fuel burns.

Thermobaric weapons consist of a fuel container and two separate explosive charges, with the first detonating to disperse the fuel particles and the second igniting the dispersed fuel and oxygen in the air, creating a blast wave of extreme pressure and heat that creates a partial vacuum in an enclosed space.

“This vacuum would then suck down the parcels until they mostly fill in the vacuum, i.e., until they move tangent to the airfoil again. This is the physical mechanism which forces the parcels to move along the airfoil shape. A slight partial vacuum remains to maintain the parcels in a curved path.”

Once the high-pressure gas has escaped, a partial vacuum is left behind in the neck of the bottle that sucks air back in.

These use air-compressors attached to the ends of tubes to create a partial vacuum that pulls cargo along.