In a convection apparatus as shown on page 93 of your textbook, the smoke travels __ in the cold chimney and it travels __ in the hot chimney. upwards; downwards downwards; upwards downwards; downwards upwards; upwards

The answer is **downwards; upwards**.<br /><br />In a convection apparatus, the hot chimney heats the air inside it. This heated air becomes less dense and rises, creating an upward draft. The smoke is carried along with this rising air. Conversely, in the cold chimney, the air is denser and sinks, creating a downward draft. The smoke will be pulled down with this sinking air.<br />