1. What is Enthalpy Change With Temperature?

Enthalpy change (ΔH) with temperature represents the heat energy absorbed or released by a substance when its temperature changes at constant pressure. It's a fundamental concept in thermodynamics and heat transfer calculations.

2. How Does the Calculator Work?

The calculator uses the enthalpy change formula:

Where:

• \( m \) — Mass of the substance (kg)
• \( C_p \) — Specific heat capacity (J/kg·K)
• \( \Delta T \) — Temperature change (K)

Explanation: The formula calculates the heat energy required to change the temperature of a given mass of substance, considering its specific heat capacity.

3. Importance of Enthalpy Calculation

Details: Accurate enthalpy calculation is crucial for thermal system design, energy balance calculations, chemical process engineering, and understanding heat transfer in various physical systems.

4. Using the Calculator

Tips: Enter mass in kilograms, specific heat capacity in J/kg·K, and temperature change in Kelvin. All values must be positive (mass > 0, Cp > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is specific heat capacity?
A: Specific heat capacity is the amount of heat energy required to raise the temperature of 1 kg of a substance by 1 Kelvin.

Q2: Why is temperature change in Kelvin?
A: Kelvin is used because it's an absolute temperature scale where 0 represents absolute zero, making it suitable for thermodynamic calculations.

Q3: Can this formula be used for phase changes?
A: No, this formula only applies to temperature changes without phase transition. For phase changes, latent heat formulas should be used.

Q4: What are typical Cp values for common materials?
A: Water: 4184 J/kg·K, Aluminum: 897 J/kg·K, Iron: 449 J/kg·K, Air: 1005 J/kg·K (at constant pressure).

Q5: How does pressure affect enthalpy change?
A: This formula assumes constant pressure. For ideal gases, enthalpy depends only on temperature, but for real substances and liquids, pressure effects may need consideration.