Specific heat capacity (c) measures how much energy a substance can absorb per unit mass per degree temperature change. Units: J/(kg·K) or cal/(g·°C).
Formula
Q = mcΔT, where Q = heat energy (J), m = mass (kg), c = specific heat, ΔT = temperature change (K or °C).
Common Values (J/kg·K)
- Water: 4,186 — highest of common materials
- Aluminum: 897
- Iron: 449
- Copper: 385
- Air: 1,005
Water's high specific heat is why coastal climates are milder than inland — oceans absorb/release heat slowly.