Burning steel wool increases its mass.
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Elemental gases in front of a Tesla coil - GIF
Gallium in water - GIF
Floating an anvil in liquid mercury - video
Putting out a magnesium fire with water - GIF
Your rusty nails weigh more than your clean ones.
We used to shoot wads of it out of a homemade black powder cannon. It would come out like a Roman Candle. Set Dad's strawberry patch (which had been mulched with leaves) on fire.
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