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T₁ = 20⁰C
T₂ = 120 ⁰C
m = 0,2 kg
Q = 20 kJ = 20 000 J
Rozw.:
Q = m × Cw × ΔT
ΔT= T₂ - T₁
Q = m × Cw × (T₂ - T₁)
Cw = Q / m × (T₂ - T₁)
Cw = 20 000 J / 0,2 kg × (120⁰C - 20⁰C) = 1000 [J /kg ×⁰C]