1. What is Unbound Moisture Weight?

Definition: The Unbound Weight of Moisture is the amount of moisture in kg present in the wet solid which exerts a vapor pressure equal to that of pure water for the system.

Purpose: This calculation helps in drying processes to determine the amount of moisture that can be easily removed from a material.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M_{Ub} \) — Unbound Weight of Moisture (kg)
• \( M_{Eq} \) — Equilibrium Weight of Moisture (kg)
• \( M_{Free} \) — Free Weight of Moisture (kg)
• \( M_{b} \) — Bound Weight of Moisture (kg)

Explanation: The formula calculates the unbound moisture by combining equilibrium and free moisture, then subtracting the bound moisture.

3. Importance of Unbound Moisture Calculation

Details: Understanding unbound moisture helps in designing efficient drying systems and predicting drying times for various materials.

4. Using the Calculator

Tips: Enter all moisture weights in kilograms. The values can be zero or positive numbers. The calculator will compute the unbound moisture weight.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between bound and unbound moisture?
A: Bound moisture exerts vapor pressure less than pure water, while unbound moisture exerts vapor pressure equal to pure water.

Q2: Can the unbound moisture weight be negative?
A: No, if the calculation results in a negative value, it indicates an error in input values as moisture weights can't be negative.

Q3: How do I determine equilibrium moisture content?
A: Equilibrium moisture is determined experimentally by exposing the material to constant temperature and humidity until weight stabilizes.

Q4: What affects bound moisture content?
A: Bound moisture depends on material properties, chemical composition, and how strongly water molecules are attached to the material.

Q5: Why is free moisture important in drying calculations?
A: Free moisture is the amount that can actually be removed during drying under given conditions.