U kakvoj se šolji kafa najbrže hladi
Vjerovatno nikad nijeste obratili pažnju, ali boja šoljice u koju je sipana vrela kafa utiče na to koliko će se brzo ona hladiti.
Jeste li primjetili da će vam tokom vrelih, ljetnjih dana biti još toplije ukoliko obučete crnu majicu?
Razlog za to je jednostavan: tamni predmeti brže apsorbuju toplotu. Vrela kafa nije izuzetak. Na isti način crna boja šolje djeluje na vrelu kafu koju ste u nju sipali, što znači da bi, ukoliko žurite i morate brzo da popijete kafu, trebalo da se odlučite za crnu, a ne bijelu šoljicu.
Kada se sprema kafa i voda u lončetu provri, njena temperatura iznosi 100 stepeni, a interesantno je da svega minut kasnije ona iznosi pedeset stepeni. Ipak, kako vrijeme odmiče, ona opada sve sporije.
Međutim, ova priča ima dvije strane medalje. Naime, tamne boje brže emituju toplotu nego svijetle. Kako biste uspostavili balans, posvijetlite kafu na neki način: nemojte piti crnu kafu ili joj dodajte mlijeko ili šlag.
Zanimljivo kako nauka prožima svaki djelić naših života, zar ne?
(Stil)
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