(E’ trattenuta all’interno dei palloncini.) Aiutate i bambini a comprendere la differenza, mettendo tutti i palloncini gonfiati in una scatola, per simulare il comportamento dell’anidride carbonica in una pagnotta. ###>Help the children to understand the difference by putting all the inflated balloons in a box to simulate the carbon dioxide in a loaf of bread, held in place by tiny ‘balloons’ of dough.