Thermal Energy in Water – Food Coloring Demonstration

#thermalenergy #energy #ngscience https://ngscience.com You may recall that all matter is made of tiny molecules that are constantly in motion. The movement of these molecules is called thermal energy. Remember, the more thermal energy matter has, the faster its molecules move and the hotter it becomes. Today, we're going to see this principle in action by observing how temperature affects the motion of molecules in water. We'll use food coloring as a visual tracker to reveal the invisible dance of water molecules at different temperatures. First, prepare two beakers that are each three-quarters full — one with very cold water and one with hot water. Now, here's the key moment: Drop one yellow and one blue food coloring drop into each beaker. When blue and yellow, which are primary colours, mix, they create green, a secondary colour. Observe carefully and compare what happens in both beakers. Notice how the food coloring behaves differently in each beaker. In the hot water, the colors quickly swirl, spread, and blend into green. In the cold water, the movement is much slower and more gradual. Why? This dramatic difference reveals what's happening at the molecular level. The water molecules in the hot water are moving rapidly, constantly colliding with the food coloring molecules with greater force and frequency. These energetic collisions push the color throughout the water quickly. In contrast, the slower-moving molecules in the cold water bump into the food coloring less often and with less force, resulting in much slower diffusion. This experiment beautifully demonstrates that thermal energy truly is energy in motion.