fire - explosion - boom.
no u cant
DO NOT smoke near a tank.
In normal circumstances, nothing will happen. Gas tanks are designed and built to prevent leakage so there should be no propane in the air around the tank. In the event that the tank becomes faulty or the valve is opened to let propane escape into the air, there is a risk of explosion triggered by cigarettes, other flames or a spark.
they use oxygen mask to breath so they die in all the smoke
Yes. There is no problem with breathing straight from the tank. Even in airplanes, as you reach an altitude of around 20,000 feet, you are breathing 100% Oxygen. Just don't smoke while you are doing it.
It is not good if oil is put into a cars gas tank. In many cases, the car will not run properly, and it will smoke. Depending on the amount, it might just smoke and then run fine.
They would die from lack of hygiene and Oxygen.
Oxygen tank!
A simple device called a bore evacuator (the cylinder around the main armament) exhausts most of the smoke to the outside of the tank. In World War 2 before the bore evacuator was invented, the faces of tank commanders and loaders were blackened by the smoke when the breech was opened.
Yes, a tank of oxygen can be half full. The oxygen would be stuck in said tank meaning no more oxygen can get in unless refueld.
oxygen tank
Oxygen tank.