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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 13 - Thermal Expansion, Calorimetry and Transmission of Heat > Heat is required to change 1 kg of ice at -20 C into steam. Q1 is the heat needed to warm the ice from -20 c to 0 c, Q2 is the heat needed to melt the ice, Q3 is the heat needed to warm the water from 0 degree C to 100 degree C and Q_4 is the heat needed to vapourize the water. Then

Heat is required to change 1 kg of ice at -20 C into steam. Q1 is the heat needed to warm the ice from -20 c to 0 c, Q2 is the heat needed to melt the ice, Q3 is the heat needed to warm the water from 0 degree C to 100 degree C and Q_4 is the heat needed to vapourize the water. Then

Heat is required to change 1 kg of ice at -20 C into steam. Q1 is the heat needed to warm the ice from -20 c to 0 c Q2 is the heat needed to melt the ice Q3 is the heat needed to warm the water from 0 degree C to 100 degree C and Q_4 is the heat needed to vapourize the water. Then