Which of the following pairs is not correctly matched in the term of Spray and Volume median diameter (μm or u)?

A. Mist spray ⇔ 51 - 100

B. Aerosal/fog ⇔ 1 - 50

C. Smoke ⇔ 0.01 - 1

D. Vapor ⇔ > 400

Answer: Option D

Solution(By Examveda Team)

A. Mist spray is a spray type where volume median diameter is 51 - 100 μm or u.
B. Aerosol or fog is a spray type where volume median diameter is 1 - 50 μm or u.
C. Smoke is a spray type where the volume median diameter is 0.01 - 1 μm or u.
D. The volume median diameter of Vapour is greater than 400 μm or u is not correctly matched.