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m = 1kg
t_p = 22 C
t_w = 100 C
c_w = 4187 J/(kg·K) (źródło Wikipedia)
szukane:
Q = ?
delta t = t_w - t_p = 78 C
Zmiana tempertury w C jest taka sama jak zmiana w K
delta T = delta t = 78 K
Q = c_w * delta T * m
Q = 4187 J/(kg·K) * 78 K * 1 kg = 326586 J = 326,586 kJ