Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
The cold air that blows from the land towards the sea during the night, is called a land breeze The cold air that blows from the sea towards the land during the day is known as the sea breeze. These breezes are examples of a natural convection current.
Natural convection currents
APPEARS IN
संबंधित प्रश्न
The amount of water vapour in air is determined in terms of its ______.
On a winter day the temperature of the tap water is 20°C whereas the room temperature is 5°C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10 m s−2.
A 50 kg man is running at a speed of 18 km h−1. If all the kinetic energy of the man can be used to increase the temperature of water from 20°C to 30°C, how much water can be heated with this energy?
Explain the following
A glass bottle completely filled with water and tightly closed at room temperature is likely to burst when kept in the freezer of a refrigerator.
How do fishes survive in frozen lakes?
Why does a thick glass tumbler crack when very hot water is poured in it?
Give reasons for the following:
Even when the water in the lakes is frozen, fish can survive.
Write scientific reason.
Fish can survive even in frozen ponds in cold regions.
Observe the given picture and answer the following questions.
- Which property do you understand in this picture?
- What is the temperature of the water at the surface?
- What is the temperature below the layer of ice on the surface?
