ANS:B - 4.08

1 centistoke is equal to approximately 0.408 Redwood I seconds.

Explanation:

• Centistoke (cSt): It is a unit of kinematic viscosity.
• Redwood I seconds: This is another unit used for measuring kinematic viscosity, commonly in the oil industry.

The relationship between these two units is: 1 centistoke (cSt)≈0.408 Redwood I seconds1 \text{ centistoke (cSt)} \approx 0.408 \text{ Redwood I seconds}1 centistoke (cSt)≈0.408 Redwood I seconds This conversion factor helps in translating kinematic viscosity measurements between these units, facilitating comparisons and calculations in relevant industrial processes.