Symptoms and effects. The illustration shows severe gall infection at the upper crown area on the roots of a peach seedling. Galls form on the crown of the plant (the point at the soil line where the main roots join the stem) and on the roots. They can also form on the main stem above soil level, or on the branches. Galls first appear as small, pale, roughened lumps of tissue. They enlarge, darken, and become convoluted.
Conservation of energy. Conservation of energy, principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant. The first kind of energy to be recognized was kinetic energy, or energy of motion.
Although energy can change forms, all energy in a closed system and must remain constant. 1  The law of Conservation of Mass: Mass can not be created or destroyed. 2  The law of Conservation of Energy: Energy can not be created or destroyed. 3  The law of Conservation of Mass-Energy. Neither energy nor mass can be created or destroyed, instead mass is conserved as energy or energy is conserved as mass. A combination of the law of conservation of energy and conservation of mass (based on E = mc2 (energy mass equivalence)).