Standard Value Of Coefficient Of Permeability Calculator

Standard Coefficient of Permeability Formula:

\[ K_s = K_t \times \left( \frac{v_t}{v_s} \right) \]

Coefficient of Permeability at any Temperature t:

cm/s

Kinematic Viscosity at t° C:

m²/s

Kinematic Viscosity at 20° C:

m²/s

Standard Coefficient of Permeability at 20°C:

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1. What is the Standard Coefficient of Permeability?

The Standard Coefficient of Permeability at 20°C refers to the coefficient of permeability of pure water at standard temperature. It provides a standardized measure for comparing permeability across different conditions and materials.

2. How Does the Calculator Work?

The calculator uses the standard permeability conversion formula:

\[ K_s = K_t \times \left( \frac{v_t}{v_s} \right) \]

Where:

\( K_s \) — Standard Coefficient of Permeability at 20°C (cm/s)
\( K_t \) — Coefficient of Permeability at any Temperature t (cm/s)
\( v_t \) — Kinematic Viscosity at t° C (m²/s)
\( v_s \) — Kinematic Viscosity at 20° C (m²/s)

Explanation: This formula adjusts the permeability coefficient measured at any temperature to the standard reference temperature of 20°C using the ratio of kinematic viscosities.

3. Importance of Standard Coefficient Calculation

Details: Standardizing permeability coefficients to 20°C allows for consistent comparison of results across different testing conditions and laboratories, eliminating temperature-dependent variations in fluid viscosity.

4. Using the Calculator

Tips: Enter the coefficient of permeability at the measured temperature, along with the kinematic viscosities at both the measured temperature and at 20°C. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why standardize to 20°C?
A: 20°C is the internationally recognized standard temperature for permeability measurements, allowing for consistent comparison of results across different studies and laboratories.

Q2: What is kinematic viscosity?
A: Kinematic viscosity is a measure of a fluid's internal resistance to flow under gravitational forces, calculated as the ratio of dynamic viscosity to density.

Q3: How does temperature affect permeability measurements?
A: Temperature affects fluid viscosity, which in turn influences the measured permeability. Higher temperatures generally result in lower viscosity and higher apparent permeability.

Q4: What are typical values for coefficient of permeability?
A: Permeability coefficients vary widely depending on the material, ranging from 10⁻¹ cm/s for gravel to 10⁻⁹ cm/s for clay.

Q5: When is this standardization most important?
A: This standardization is crucial when comparing permeability results from different sources, conducting research, or when precise measurements are required for engineering applications.