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
Molecules of a substance are always in a state of............ and so they possess .............
Explain the term Melting.
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?
The fixed temperature at which matter changes state from solid to liquid is called ______.
What are the changes of state in water? Explain.
Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?
In an endothermic process, the speed of the molecules is ______ hence they move faster.
______ is the changing of a liquid into its solid state and it happens by cooling.
Sweating causes cooling because water has a ______.
The solid, liquid, and phases of water can coexist in equilibrium at ______.
