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प्रश्न
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
उत्तर
Water in the form of ice has low energy since water freezes at a lower temperature. When ice comes in contact with body it draws heat from the body and gives cooling effect. In case of steam, the water molecules have high energy. The high energy of steam is transformed as heat and may cause severe burns.
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संबंधित प्रश्न
Molecules of a substance are always in a state of............ and so they possess .............
Differentiate between melting point ,giving atleast one example of each.
Explain the term Melting Point.
The fixed temperature at which matter changes state from solid to liquid is called ______.
Analogy:
Melting: ice into water on heating,
freezing: _______.
A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.1.2) would correctly represent the change in its temperature as a function of time.
______ is the changing of a liquid into its solid state and it happens by cooling.
Sweating causes cooling because water has a ______.
Ice does not melt rapidly because of ______.
Explain the following effects of heat.
Change in state
