No element is lighter than hydrogen. Not even stripping the electron off a hydrogen atom would make a lighter item, because electrons have almost no mass and the proton would just grab it back anyway.
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heavier because they are two different weights
Antifreeze, Pesticide then Gasoline. Antifreeze has to weigh right at as much as water to make sure they mix in the cooling system - no bubbling up. Pesticides are made from materials lighter than water but mixed with water as a medium, so they are lighter than antifreeze. Gasoline is very light (the lighter the fuel with the same energy content, the more efficient it is), it' lighter than water so it's definitely lighter than antifreeze. Since pesticides are mostly water, in all likelihood gasoline is lighter than the pesticides.antifreeze > pesticides > gasoline
The process of fusion. The sun makes heat by fusing hydrogen atoms. Hydrogen is the lightest element, and in the process of fusion, the lighter the element being fused, the more energy (heat) is produced.
No, the oceanic crust is denser. That's why the land areas "float" so much higher than the ocean bedrock.
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