Question

while doing an experiment to determine the boiling point of water,a student heated water and observed that the temperature of water remains constant.Give reason

Answer 1

that heat is utilised for change of state
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Answer 2

hey there,
When the student supplied heat to the water then slowly the temperature of water started increasing.But when it reached 100 ° celsius the temperature didn't increase and remained constant . This was because the heat supplied by the student was utilised by the water for changing its state not for increasing the temperature. This type of heat is called latent heat. Latent heat is the hidden heat which is used to change the state of the substance or break interparticle force between the particles of the objects i.e. to increase the kinetic energy of the particles so that they gain enough kinetic energy to break free from the interparticle force. The type of latent heat observed in this experiment is the latent heat if vaporization. Latent heat of vaporization is a physical property of a substance. ... When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization. The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol.
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