chimney effect

chimney effect

[′chim‚nē i′fekt] (fluid mechanics) The tendency of air or gas in a vertical passage to rise when it is heated because its density is lower than that of the surrounding air or gas.

chimney effect, flue effect, stack effect

The tendency of air or gas in a shaft or other vertical passage to rise when heated, owing to its lower density compared with that of the surrounding air or gas.