1. What is Water Viscosity?

Water viscosity is a measure of its resistance to flow. It decreases as temperature increases. This calculator provides the dynamic viscosity of water at a specified temperature using an empirical relationship.

2. How Does the Calculator Work?

The calculator uses the viscosity-temperature relationship:

Where:

• \( μ \) — Dynamic viscosity (Pa·s)
• \( T \) — Temperature in Kelvin (must be >140K)

Explanation: The equation models how water viscosity changes exponentially with temperature, becoming less viscous as temperature increases.

3. Importance of Viscosity Calculation

Details: Water viscosity is critical in fluid dynamics calculations, pipe flow analysis, heat transfer applications, and many industrial processes involving water.

4. Using the Calculator

Tips: Enter temperature in Kelvin (must be greater than 140K). The calculator will return the dynamic viscosity in Pascal-seconds (Pa·s).

5. Frequently Asked Questions (FAQ)

Q1: What's the temperature range for this formula?
A: The formula is valid for liquid water at temperatures above 140K up to the boiling point.

Q2: How does viscosity change with temperature?
A: Water viscosity decreases as temperature increases - water flows more easily when warmer.

Q3: What are typical water viscosity values?
A: At 20°C (293K), viscosity is about 0.001002 Pa·s. At 100°C (373K), it's about 0.000282 Pa·s.

Q4: Why is viscosity important in engineering?
A: Viscosity affects pumping power requirements, heat transfer rates, and flow characteristics in pipes and channels.

Q5: Are there limitations to this formula?
A: This is an empirical approximation. For precise work, consult standard reference tables or more complex models.