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yes, too much pressure on the ear drum can damage your hearing.
It depends on the type of steel
This depends on the geometry of the balloon and the internal pressure.
2,500 pounds of pressure
The best place to find videos of people playing steel drums is on Youtube. There are hundreds of channels with so much variety, including steel drum lessons and professional players performing on stage.
It will pop because the internal pressure will be much greater than the external pressure.
neglecting the weight of the steel drum and assuming a gallon weighs 8.2 pounds in Americian units, the calc would be 55 X 8.2 = 451 pounds. The extra weight of the steel drum would sink it from this nutral boyancy state. Also,55 gallon drums only hold 50 or so gallons.
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During a tensile test of mild steel, the bar is tested until it breaks. It measures how much stress the mild steel can take before it finally breaks under the pressure.
Gas is 6.3 lbs. per gallon. 55 gallons of gas will weigh 346.5 lbs. A steel drum will weigh 40 lbs. and a plastic 55 gallon drum will weigh 20 lbs.
Weight of drum + Weight of soil = weight of drum and soil. Get some scales.