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Arrange the following steps in a sequential order to prove the convection in gases. (A) Place a lighted candle below chimnery B and hold a lighted incense stick over chimnery A. (B) The smoke given out by incense stick is sucked in through chimney A and comes out through B. (C) Take a rectangular wooden box and fix with two glass chimneys A and B on the top. (D) The lighted candle heats the air and reduces air pressure near the chimney B. The cold, heavy air washes in through chimney A, sweeping the smoke given out by incense stick. (E) On absorbing heat, the hot air molecules move away from the source of heat and molecules of cold air move towards the source of heat, froming convection currents.

Answer»

ABEDC
CABDE
EDCBA
ABCDE

Solution :Take a rectangular wooden box with two glass chimneys A and B on the top (c). Place a lighted candle below chimney B and HOLD a lighted incense stick over chimney A (a). The smoke given out by incense stick is sucked in through chimney A and COMES out through B (b). The lighted candel heats the air and reduces air pressure near the chimney B. The cold, heavy air rushes in through chimney A, SWEEPING the smoke given out by incense stick (d). On absorbing heat, the hot air molecules move away from the source of heat and molecules move away from the source of heat and molecules of coldair move TOWARDS the source of heat, forming convection currents.


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