Archimedes’ principle experiment using a hand balance:  an iron piece weights less in water then in air - Vintage Nostalgia
Archimedes’ principle experiment using a hand balance: an iron piece weights less in water then in air

Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object (Archimedes’ principle).

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Medieval coinage workshop - Vintage Nostalgia
Medieval coinage workshop

Illustration depicting the work of making coins in a Middle Ages workshop. It pops to the mind that “forge” and “forgery” share the same lineage.

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