Question

A vacuum cleaner sucks in dust on the floor because

A. atmospheric pressure is higher than the pressure inside the vacuum cleaner.

B. atmosphere pressure is lower than the pressure inside the vacuum cleaner.

C. inside the vacuum cleaner the temperature is hotter than that of the atmosphere.

D. inside the vacuum cleaner the temperature is colder than that of the atmosphere.

Answer 1

Typical vacuum cleaners produce enough suction to reduce air pressure by 20%, where suction is idea of substance flow into a partial vacuum, or region of low pressure from a region of space with higher pressure.
Things tend to go from high to low pressure, so the answer is A.