The gravity of the planet keeps the gases from escaping into space.
Ice crystals and escaping gas, such as carbon dioxide and ammonia.
Gravity, combined with low surface temperatures.
gravity keeps the gas giants planets gases from escaping so they have thick atmosphere
gravity keeps the gas giants planets gases from escaping so they have thick atmosphere
A rocket.
There are several:some rocketssome carssome lawnmowerssome airplanessome boatssome generators (they don't move far, but their engine parts move)
a pneumatic machine is a machine that uses gas usually air, to transmit a force and do workexamples: a pump for a bicycle, and a drill
Plasma cutter
If the gas jar is standing with its opening to the top, then the escaping gas is Hydrogen. If the gas jar is being held upside down ( opening to the bottom), then the escaping gas is carbon dioxide.
Presumably to prevent the gas from escaping.
rifle/ machine gun /gas/ tanks/ planes/ torpedoes
The gas inlet exists to allow for gas to enter the host with no gas escaping, or very little escaping. It serves as a moderator , since it controls the volume gas that enters the host.
Gravity.
The cork
gravity keeps the gas giants' gases from escaping
A cap that keeps the gas and gad vapors from escaping from the fuel tank.