When smoke is trapped in a box, several things can happen:<br /><br />Physical Changes<br />1. *Smoke settles*: The smoke particles will slowly settle at the bottom of the box due to gravity.<br />2. *Diffusion*: The smoke will diffuse and spread evenly throughout the box, filling the available space.<br />3. *Condensation*: If the box is cooled, the water vapor in the smoke can condense, forming droplets on the box's surfaces.<br /><br />Chemical Changes<br />1. *Oxidation*: The smoke can react with oxygen in the air, leading to the formation of new compounds.<br />2. *Decomposition*: The smoke particles can break down over time, releasing volatile organic compounds (VOCs) and other gases.<br /><br />Other Effects<br />1. *Visibility*: The trapped smoke can reduce visibility inside the box.<br />2. *Odor*: The smoke can leave a lingering odor inside the box.<br />3. *Air quality*: The trapped smoke can affect the air quality inside the box, potentially making it unhealthy to breathe.<br /><br />Keep in mind that the specific effects will depend on the type of smoke, the size and material of the box, and the environmental conditions.