Unit conversion (kinematic viscosity):\n1 m^2/s is equal to how many stokes (1 stoke = 1 cm^2/s)?

Difficulty: Easy

Correct Answer: 10^4

Explanation:


Introduction / Context:
Kinematic viscosity is commonly reported in SI units (m^2/s) and in cgs units (Stokes, where 1 St = 1 cm^2/s). Accurate unit conversion is essential in fluid mechanics, pump sizing, and heat-and-mass-transfer calculations, especially when mixing data from different standards.


Given Data / Assumptions:

  • 1 stoke (St) = 1 cm^2/s.
  • 1 m = 100 cm.
  • Goal: convert 1 m^2/s into St.


Concept / Approach:
Use the length conversion squared. Since 1 m = 100 cm, then 1 m^2 = (100 cm)^2 = 10^4 cm^2. Therefore, 1 m^2/s corresponds to 10^4 cm^2/s, which equals 10^4 stokes.


Step-by-Step Solution:

Start: 1 m^2/s.Convert area: 1 m^2 = (100 cm)^2 = 10^4 cm^2.Therefore: 1 m^2/s = 10^4 cm^2/s.Recognize 1 St = 1 cm^2/s ⇒ 1 m^2/s = 10^4 St.


Verification / Alternative check:
Dimensional analysis confirms the squared factor: converting a squared unit always multiplies by the square of the linear conversion factor.


Why Other Options Are Wrong:

  • 10, 10^2, 10^3: undercount because they fail to square the 100 cm per meter factor.
  • 10^5: overcount; would correspond to 316.2 cm per meter, which is incorrect.


Common Pitfalls:
Forgetting to square when converting squared units; confusing stokes with centistokes (1 cSt = 0.01 St).


Final Answer:
10^4

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