Či sú potraviny čerstvé, zistíme pohľadom alebo ovoniame ale pri vajíčkach to nejde, vyzerajú stále rovnako.
Urobme pokus:
V miske rozpustíme 1 PL soli a do tohto roztoku ponoríme vajce. Úplne čerstvé vajce klesne na dno, nie celkom čerstvé pláva na vode do polovice ponorené a staré vajce pláva úplne na povrchu.
Do misky s vodou vsypeme 1 PL soli
Staré vajce pláva úplne na povrchu
Čerstvé vajce klesne na dno
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