We sit in a room with windows open. Then,

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(B) The correct answer is $(B)$.Gas molecules in a room are in constant,random thermal motion. Due to the high speed of these molecules and the relati

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air pressure is nearly the same on the floor,the walls,and the ceiling

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(B) The correct answer is $(B)$.Gas molecules in a room are in constant,random thermal motion. Due to the high speed of these molecules and the relatively small height of a room,the effect of gravity on the density distribution of the air inside the room is negligible.According to the kinetic theory of gases,pressure is exerted by the collisions of gas molecules with the walls of the container. Since the distribution of gas molecules is uniform throughout the room,the frequency and force of these collisions are essentially the same on the floor,the walls,and the ceiling.Therefore,the air pressure is nearly the same on the floor,the walls,and the ceiling.

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