My family and I were making bread the other night and my mother had to teach us how a flat piece of dough could turn into a delicious, golden brown loaf. All she knew was that heat made the dough rise, but there is so much more physics involved in making bread rise. In terms of energy, as heat from the oven goes into the dough, the heat energy is turned into mechanical energy in the molecules of the bread, mostly in the form of kinetic energy. This conversion from heat energy to kinetic energy causes the molecules to increase their speed and begin colliding with one another. As the rate of collision's increase, the molecules "look" for more room as to not collide with so many other molecules. This causes the bread to rise as the molecules push outward to avoid hitting other molecules. The conversion of energy combined with molecular movement causes the dense dough to become a fluffy loaf of bread.