1. What is Specific Internal Energy of Water?

Specific internal energy (u) is the energy stored in water per unit mass due to its temperature. It helps us understand how much energy water contains at different temperatures.

2. How Does the Calculator Work?

The calculator uses the simplified water energy equation:

Where:

• \( u \) — Specific internal energy (J/kg)
• \( T \) — Temperature of water (°C)
• 4186 — Specific heat capacity of water (J/kg·°C)

Explanation: The equation shows that for every degree Celsius increase in temperature, each kilogram of water gains about 4186 joules of energy.

3. Importance of Energy Calculation

Details: Understanding water's energy helps in designing heating systems, studying weather patterns, and learning about energy conservation.

4. Using the Calculator

Tips: Enter water temperature in °C (between -50°C and 150°C). The calculator will show how much energy is stored in each kilogram of water at that temperature.

5. Frequently Asked Questions (FAQ)

Q1: Why 4186 J/kg·°C?
A: This is water's specific heat capacity - it takes 4186 joules to heat 1kg of water by 1°C.

Q2: Does this work for ice or steam?
A: No, this simplified version only works for liquid water. Phase changes require more complex calculations.

Q3: What's a typical energy value for room temperature water?
A: At 20°C, u ≈ 83,720 J/kg (4186 × 20).

Q4: Why is this important for kids to learn?
A: It helps understand basic thermodynamics and energy concepts in everyday life.

Q5: How accurate is this simple equation?
A: It's quite accurate for liquid water between 0-100°C, though real water's heat capacity varies slightly with temperature.