question_answer

Water in a closed tube is heated with one arm placed vertically above an arc lamp. Water will begin to circulate along the tube in a counterclockwise direction. Is this true or false?     

Answer:

                False. Water will circulate in the clockwise direction. The molecules immediately above the arc receive heat by conduction. They rise up and get replaced by cold molecules from the right side. This will make the water circulate in clockwise direction.