Multiple choice

Which of the following is the most viscous medium?

  1. Water

  2. Glycerine

  3. Coaltar

  4. Air

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Viscosity measures a fluid's resistance to flow. Among these options, coaltar has the highest viscosity - it is extremely thick and flows very slowly compared to water or even glycerine. Air has negligible viscosity.