1. What is Free Moisture Weight?

Definition: The Free Weight of Moisture is the amount of moisture higher than the equilibrium moisture content that can be removed from the solid by drying.

Purpose: This calculation helps in determining the removable moisture content in drying operations for various materials.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M_{Free} \) — Free weight of moisture (kg)
• \( M_i \) — Initial weight of moisture (kg)
• \( M_{Eq} \) — Equilibrium weight of moisture (kg)

Explanation: The free moisture is simply the difference between the initial moisture content and the equilibrium moisture content.

3. Importance of Free Moisture Calculation

Details: Accurate calculation of free moisture helps in designing drying systems, estimating drying time, and optimizing energy consumption.

4. Using the Calculator

Tips: Enter the initial moisture weight and equilibrium moisture weight in kg. Both values must be > 0 and initial weight must be ≥ equilibrium weight.

5. Frequently Asked Questions (FAQ)

Q1: What is equilibrium moisture content?
A: The moisture content at which the material neither gains nor loses moisture when exposed to air at given conditions.

Q2: Can free moisture be negative?
A: No, free moisture cannot be negative as initial moisture cannot be less than equilibrium moisture in normal conditions.

Q3: What units should I use?
A: The calculator uses kilograms (kg) for both input and output values.

Q4: How do I determine equilibrium moisture content?
A: It's typically determined experimentally or from material property databases.

Q5: What if my material has no equilibrium moisture?
A: For completely dry materials, equilibrium moisture would be zero.