How does the appearance of the liquid change? Plasma: At any given time, the surface of the sun has thousands of roiling convection cells as large as the entire earth.
Adding food coloring highlights the movement of these convection currents. What do you notice about the patterns created on the surface of the liquid now? Teaching Tips Soap manufacturers often change their formulas. Even the air surrounding your body convects.
Going Further Convection happens in all types of fluids and locations.
At the beginning of this experiment, because you thoroughly mixed the soapy liquid in the pan before heating it, the temperature and density of the soapy liquid is the same throughout. Laboratory ovens use either natural air convection, forced air convection or vacuum process for heating and drying.
What do you observe? This causes the convection cells to widen and become extremely well defined.
This lighter liquid is pushed upward in localized columns by denser, cooler liquid. When overheated, the stearate molecules will break down, causing the pearlescent luster to vanish and your solution to turn clear.
A vacuum oven requires an external vacuum pump to provide low pressure environment which minimize oxidation during drying. Use the hot pads or oven mitts to remove the pan from the hot plate be careful not to burn your fingers!