NCERT Solution for Class 9 Science Chapter 1
Matter in Our Surroundings
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-12
Questions No-7
Why is ice at 273 K more effective in cooling than water at the same temperature?
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Ice at 273 K is less energetic than water. It is because of the difference in the latent heat of fusion which is present in water at the same temperature in the form of extra energy.
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Ice at 273 K will absorb heat energy or latent heat from the medium to overcome the fusion to become water. Hence the cooling effect of ice is more than the water at same temperature because water does not absorb this extra heat from the medium.
Certainly, here are the key points regarding why ice is more efficient in cooling at 273 K (0°C) compared to water at the same temperature:
1. Phase change without temperature change: Ice undergoes a phase change into water at 0°C without changing its temperature. This phase change involves absorbing energy from the surroundings to break intermolecular forces (latent heat of fusion).
2. Efficient heat absorption: During the phase change from ice to water, energy is absorbed from the surroundings, resulting in a cooling effect without a change in temperature. This process makes ice an effective heat absorber at 0°C.
3.Water lacks this phase change: Water at 273 K (0°C) does not undergo a phase change at this temperature. It remains as water without the additional energy absorption observed during the phase transition from ice to water.
4. Advantage of phase change: Ice’s ability to convert to water while absorbing heat without changing temperature allows it to extract more energy from the environment, making it a superior cooling agent compared to water at the same temperature, which does not exhibit this phase change effect.