Question

sierra helps her father install an air purifier in her house. what type of separation method does an air purifier use to remove dust and allergens from the air?
a. distillation
b. filtration
c. evaporation
d. magnetic attraction

Explanation:

• Distillation (A) separates mixtures based on boiling points, not for solid - gas separation like dust from air.
• Filtration (B) is used to separate solids from fluids (liquids or gases) by passing the fluid through a medium that traps the solid particles. Air purifiers use filters to trap dust and allergens from the air, so this matches.
• Evaporation (C) is the process of a liquid turning into a gas, not for removing solid particles from air.
• Magnetic attraction (D) is used to separate magnetic materials from non - magnetic ones, and dust/allergens are not typically magnetic.

Answer:

B. filtration