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प्रश्न
It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why?
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उत्तर
Priyanshi is wearing cotton clothes which are more comfortable in summers because cotton absorbs the sweat which causes cooling on evaporation. Ali is wearing nylon clothes that do not absorb sweat. Hence, Ali will be uncomfortable.
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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.
Some ice is taken in a beaker and its temperature is recorded after each one minute. The observations are listed below
| Time (in minute) | Temperature (in °C) |
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 3.8 |
| 7 | 7.6 |
| 8 | 11.4 |
From the above observations, what conclusion do you draw about the melting point of ice?
State the melting point of ice.
Analogy:
Melting: ice into water on heating,
freezing: _______.
What is melting? Give example.
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
______ is the changing of a liquid into its solid state and it happens by cooling.
Explain the following effects of heat.
Change in state
Define the following:
Melting or fusion:
