Advertisements
Advertisements
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?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
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.
The fixed temperature at which matter changes state from solid to liquid is called ______.
What are the changes of state in water? Explain.
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
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 ______.
The solid, liquid, and phases of water can coexist in equilibrium at ______.
