Chapter 1

NCERT
Class 9
Science
Solutions
3. For any substance, why does the temperature remain. Constant during the change of state ?

Question:

For any substance, why does the temperature remain. Constant during the change of state?

Answer:

Temperature:

  • Temperature is a feature of matter that represents the energy of motion of its constituent particles.
  • It is an estimate of how hot or cold a material is compared.
  • Absolute zero is the coldest theoretical temperature.

Reason for constant temperature during change of state :

  • Because the heat energy necessary to change the state of matter is used to break the intermolecular interactions and other attraction forces, the temperature is set during the change of state.
  • Because the provided heat is adequate to raise the substance's temperature and is used up to modify the substance's state of matter, the temperature remains constant.
  • As a result, the temperature remains constant since all of the heat is used and no external releases heat or absorbs it.
  • In short, heat is utilized in latent heat conversion.

Latent heat:

  • Latent heat is described as heat or energy absorbed or released during a substance's phase shift.
  • It could be from a gas to a liquid or from a liquid to a solid and vice versa. Enthalpy is a heat characteristic linked to latent heat.
  • The temperature of any substance remains constant throughout a state shift since the heat energy produced is used up in changing the state of matter and also for breaking numerous bonds or attractive forces.

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