7 Arrange the following steps in a sequential order to explain the formation of convectional currents through ventilation. (p) Hot air passes out through the ventilators and creates low pressure region in the rooms. (9) The rooms are provided with ventilators at the top (r) Hot air in the room is less denser and it raises up. (s) The cold air enters into the room through windows from high pressure to low pressure region. (A) rosa (B) arps (C) qpsr (D) qprs
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