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प्रश्न
Why does the temperature of a substance remain constant during the change of state ?
उत्तर
All substances change their state by gaining or loosing heat equal to their latent heat. On gaining heat kinetic energy of molecules increases and vice versa. During the change in state of matter, heat being absorbed or released, is utilized for bringing about a change in kinetic energy of molecules and not for rising or loosing the temperature. Therefore, the temperature of a substance remains constant during change in state.
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संबंधित प्रश्न
Convert the following temperature to Celsius scale:
573 K
Write the relation between Kelvin scale and Celsius scale of temperature.
Fill in the following blank with suitable words :
Temp on Kelvin scale = Temp on Celsius scale + ........................
Fill in the following blank with suitable words :
Scientists say that there are actually five states of matter : solid, liquid, gas, .................... and ...................
When heat is constantly supplied by a gas burner with small flame to melt ice, then the temperature of ice during melting :
The latent heat of vaporisation of water is :
Give two examples of the following:
Substances which are rigid and not compressible
Fill in the blanks with the correct word/s from the bracket.
Ice on absorption of heat converts to ‘X’ a process called ____ [vaporization / melting]. ‘X’ changes to water vapour on ____ [heating / cooling]. Water vapour changes back to ‘X’ on ____ [freezing / condensation]. The constant temperature at which ice changes into ‘X’ is called its ____ [fusion point / melting point / boiling point].
State if the following is a physical property of a substance.
Water acidified with dilute sulphuric acid is a good conductor of electricity.
What is it made from? Why?
The sheets used for roofing.
