Question

during ventilation what is the direction of convection current.

Answer 1

A breeze at the beach also flows due to convection. On a warm day, the air above land heats up more quickly than the air above the sea. When the air above land heats up, it becomes less dense and rises, allowing colder air above the sea to rush in to fill the empty space.

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Answer 2

In a ventilation lineup powered by natural convection, we'd see hoter, less dense air rising, and cooler, more dense air slipping in underneath it. That's the general way a convection cycle begins. The location of a heat source will help determine what's happening. If an oven is on and hot, it will heat air in its vicinity. This hot air will rise and be displaced by cooler air. The heated air will cool in the area higher up and sink, and the cooler air that moved in near the oven will be heated and rise. A "circle" or cycle of convection will have been set up.