1. What is Heat of Vaporization?

Heat of vaporization is the amount of heat energy required to convert a substance from liquid to vapor phase at constant temperature and pressure. For water, the latent heat of vaporization is approximately 2260 kJ/kg at standard conditions.

2. How Does the Calculator Work?

The calculator uses the heat of vaporization formula:

Where:

• \( HV \) — Heat of vaporization (kJ)
• \( m \) — Mass of the substance (kg)
• \( Lv \) — Latent heat of vaporization (kJ/kg)

Explanation: The equation calculates the total energy required to vaporize a given mass of substance based on its specific latent heat.

3. Importance of Heat Calculation

Details: Accurate heat calculation is crucial for engineering applications, energy efficiency analysis, thermodynamic studies, and industrial processes involving phase changes.

4. Using the Calculator

Tips: Enter mass in kilograms and latent heat in kJ/kg. The default value for water's latent heat (2260 kJ/kg) is pre-filled. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical latent heat value for water?
A: For water at 100°C and standard pressure, the latent heat of vaporization is approximately 2260 kJ/kg.

Q2: Does latent heat change with temperature?
A: Yes, latent heat decreases with increasing temperature and becomes zero at the critical point.

Q3: What units should I use for mass?
A: Mass should be entered in kilograms (kg) for consistent units with kJ/kg for latent heat.

Q4: Can this calculator be used for other substances?
A: Yes, simply input the appropriate latent heat value for the specific substance you're working with.

Q5: Why is heat of vaporization important?
A: It's essential for designing heating systems, calculating energy requirements, and understanding thermodynamic processes in various applications.