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प्रश्न
Give scientific reason.
Dew drops form on the grass in winter.
उत्तर
In winter, the temperature drops at night, due to which the water vapour present in the air cools down and turns into water droplets through the process of condensation. When this cold air comes in contact with the surface of the grass, the water vapour condenses and collects on the grass in the form of dew droplets.
संबंधित प्रश्न
Fill in the blank
Heat is a form of _______.
Draw a labelled diagram of a thermo flask. Explain how the transfer of heat by conduction, convection and radiation is reduced to a minimum in it.
Cooking utensils are made from metals due to their property of ______.
Which of the following substances will absorb more heat energy?
______ energy can be generated by the burning of fuels like coal, wood, charcoal, gasoline, etc.
In the past, people used to rub two wooden pieces together to light fire.
Which of the following is true?
Warm air is ______.
Match the following:
| Column A | Column B | ||
| 1. | Heat | a. | Heat gained or lost in the change of state without any change in temperature |
| 2. | m × L. | b. | Heat gained or lost when there is no change of state |
| 3. | Temperature | c. | Form of energy |
| 4. | m × s × t | d. | SI unit of specific latent heat |
| 5. | J/Kg | e. | degree of hotness or coldness |
