🎓 Physics • Thermodynamics
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Heat Energy Calculator (Q = mcΔT)
Computes thermal heat energy absorbed or released with specific heat capacity presets for common materials.
Thermal Energy Transfer (Specific Heat)
Calculate heat gained or lost by a substance: Q = m · c · ΔT
Q = mcΔT
Heating Scenarios:
Common Material Heat Capacities (c in J/kg·K):
Heat Flow & Temperature DifferenceΔT = +60.0 °C
Total Thermal Energy Transfer (Q)
627,600 Joules (J)
🔥 Energy Gained / Absorbed (Endothermic)
Kilojoules627.600 kJ
Kilocalories150.00 kcal
BTU594.85 BTU
Watt-hours174.33 Wh
Step-by-Step Derivation
1. Formula: Sensible Heat Transfer Q = m · c · ΔT
2. Temperature Difference: ΔT = T_final - T_initial = 80°C - 20°C = 60.00 K (or °C)
3. Substitution: Q = (2.5 kg) × (4184 J/kg·K) × (60.00 K)
4. Heat Transferred: Q = 627600.00 Joules (J)
5. Thermal Direction: Heat is ABSORBED (+Q) by the substance (endothermic).
6. Equivalent Units: 627.600 kJ | 150.00 kcal | 594.85 BTU | 0.1743 kWh
What is Specific Heat?
Specific heat capacity is the amount of heat energy required to raise the temperature of 1 kg of a substance by 1 Kelvin.
Formula & Step-by-Step Calculation
Q = m × c × ΔT
Mass times specific heat times temperature difference.
Worked Step-by-Step Examples
Example 1
Heating 2.5 kg water from 20°C to 80°C
Solution: 627,600 Joules (627.6 kJ or 150 kcal)
• 2.5 × 4184 × (80 - 20) = 627,600 J
Common Real-World & Academic Use Cases
- ✓ HVAC thermal heating load calculations
- ✓ Boiler water heating power
- ✓ Calorimetry chemical reaction heat
How to Use the Heat Energy Calculator (Q = mcΔT)
1
Enter Mass & Temp Change
Input kg and °C.
2
Select Specific Heat
Type or click material presets.
3
Inspect Heat Energy
Review Joules and kilocalories.
Frequently Asked Questions
Q: Why does water have such a high specific heat?
Strong intermolecular hydrogen bonds require large amounts of thermal energy to increase molecular kinetic motion.