Advertisements
Advertisements
प्रश्न
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
The temperature at which a solid convert into a liquid is called its .........
Molecules of a substance are always in a state of............ and so they possess .............
Explain the term Melting.
Explain the term Melting Point.
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?
Analogy:
Melting: ice into water on heating,
freezing: _______.
What is melting? Give example.
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.
Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?
Ice does not melt rapidly because of ______.
