Ключевые слова: analysing, ash, ash dragon, ash snake, ash tree, burning, calcium gluconate, carbon, chemical, chemical experience, chemistry, closeup, crinkle, demonstration, dust, education, educational, energy, experience, fire, flame, formation, formula, fume, gorenje, grow, heat, hot, incandescent, lab, laboratory, light, material, particle, pharaohs snake, presentation, product, result, science, scientific, smoke, smokey, spark, substance, teaching, technology, test, training, up, urotropin,