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As an illustration, a 500-pound (227-kg) boat will sink within the water until it has displaced 500 pounds of water. There's a substantial amount of air inside, so a properly-designed 500-pound ship will displace the five hundred pounds of water to cancel out its weight well before it sinks under a desired point. And because it has an atmospheric lifetime of 3,200 years, every molecule of it launched by industries and lab experiments will stick around for quite a very long time.



On high of this, each molecule of SF6 additionally weighs greater than an air molecule. When you released a balloon filled with sulfur hexafluoride (molecular weight 146) and a balloon full of helium (molecular weight 4) into the air (molecular weight 29), the helium balloon would rise to the ceiling and the one stuffed with SF6 would sink to the floor. Larsen, Joe. "What's the physics behind the voice change which happens when one inhales Helium?" Physics Link.



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