SC-441

Diffusion

Lower Sec Science · Secondary 1 · Hard · Diffusion

A student investigates how temperature affects the rate of diffusion of perfume in air.

He sprays the same amount of perfume in two identical rooms. Room A is at

20^\circ\text{C}

and Room B is at

35^\circ\text{C}

. He measures the time taken for the smell to be detected at the opposite end of each room.

Which statement explains what he should observe?

The smell reaches the end faster in Room B because particles move faster at higher temperature.
The smell reaches the end faster in Room A because cooler air is denser.
The smell reaches both ends at the same time because the amount of perfume is the same.
No smell is detected in Room B because particles move too fast to collide.

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