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 operations and process engineering 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)
• \( M_i \) — Initial Weight of Moisture (kg)
• \( M_b \) — Bound Weight of Moisture (kg)

Explanation: The bound moisture is subtracted from the initial moisture content to determine the unbound moisture that can be removed through drying.

3. Importance of Unbound Moisture Calculation

Details: Knowing the unbound moisture content helps in designing drying systems, estimating drying times, and optimizing energy usage in industrial processes.

4. Using the Calculator

Tips: Enter the initial moisture weight and bound moisture weight in kilograms. Both values must be ≥ 0, and initial weight must be ≥ bound weight.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between bound and unbound moisture?
A: Bound moisture exerts less vapor pressure than pure water and is harder to remove, while unbound moisture behaves like free water.

Q2: How do I measure initial moisture content?
A: Typically measured by weighing the wet sample, drying it completely, and measuring the weight difference.

Q3: What affects bound moisture content?
A: Material properties, chemical composition, and how strongly water molecules are attached to the material.

Q4: Can unbound moisture be negative?
A: No, the calculator ensures initial weight is always ≥ bound weight to prevent negative results.

Q5: What industries use this calculation?
A: Food processing, pharmaceuticals, ceramics, paper manufacturing, and other drying-intensive industries.