2 A kovács a meleg vasat a hideg vízbe teszi. A vas
energiája 300 kJ-lal csökkent. Mennyivel nőtt a vízé?

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.