Concept explainers
(a)
Interpretation:
The reason due to which perspiration cools the body, during the heavy exercise should be explained.
Concept Introduction:
Evaporation is the process of converting water (mostly) in liquid state to the gaseous state. Due to change in state of water from liquid to gas its temperature increases and energy is required for such change in state, Thus the water molecules undergoing evaporation, decreases the temperature of the surface by absorbing the heat energy from it.
(b)
Interpretation:
The reason for wet towels to dry quickly on a hot summer day as compared to a cold winter day should be explained.
Concept Introduction:
Evaporation is the process of converting water (mostly) in liquid state to the gaseous state. Due to change in state of water from liquid to gas its temperature increases and energy is required for such change in state, Thus the water molecules undergoing evaporation, decreases the temperature of the surface by absorbing the heat energy from it. The process of evaporation increases on increasing the temperature.
(c)
Interpretation:
The reason for wet clothes to not dry in the plastic bag should be explained.
Concept Introduction:
Evaporation is the process of converting water (mostly) in liquid state to the gaseous state. Due to change in state of water from liquid to gas its temperature increases and energy is required for such change in state, Thus the water molecules undergoing evaporation, decreases the temperature of the surface by absorbing the heat energy from it. The process of evaporation increases on increasing the temperature.
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