Take water in a pot. place few crystals of potassium permanganate or 4

1.	Take water in a pot. place few crystals of potassium permanganate or 4-5 beads of tea leaves in it and heat. Observe water in a pot carefully. you may find that water rises above from the centre and lowered from here and there fig. Colourful currents are set in water. why does this happen?when the bottom of the pot is heated the water molecules absorb heat and move upwards whereas the upper molecules are cool and move towards the bottom of pot.By this mechanism, the liquid molecules itself move from one place to another to transfer heat. This method of heat transfer is called convection of heatAir also convects heat. Air molecules also become lighter after absorption of heat and move bottom to the top.The upper cold molecules of air move downward to gain heat.1. Why does colourful current set up in water why does this happen?2. What is called this method of transfer of heat?3. How is heat transferred in convection method?4. By which methods heat is transferred in air?
Answer» 1. When bottom of the pot is heated the water molecules at the bottom gain heat and move up with coloured water and the colder molecules at the top move down. This is repeated so long water is heated. As a result colourful currents form set. 2. This method of transfer of heat is called convection. 3. In convection method the molecules of liquid move itself to transfer heat from one place to another. 4. In air heat is transferred by convection method.

Take water in a pot. place few crystals of potassium permanganate or 4-5 beads of tea leaves in it and heat. Observe water in a pot carefully. you may find that water rises above from the centre and lowered from here and there fig. Colourful currents are set in water. why does this happen?when the bottom of the pot is heated the water molecules absorb heat and move upwards whereas the upper molecules are cool and move towards the bottom of pot.By this mechanism, the liquid molecules itself move from one place to another to transfer heat. This method of heat transfer is called convection of heatAir also convects heat. Air molecules also become lighter after absorption of heat and move bottom to the top.The upper cold molecules of air move downward to gain heat.1. Why does colourful current set up in water why does this happen?2. What is called this method of transfer of heat?3. How is heat transferred in convection method?4. By which methods heat is transferred in air?

Answer»

1. When bottom of the pot is heated the water molecules at the bottom gain heat and move up with coloured water and the colder molecules at the top move down. This is repeated so long water is heated. As a result colourful currents form set.

2. This method of transfer of heat is called convection.

3. In convection method the molecules of liquid move itself to transfer heat from one place to another.

4. In air heat is transferred by convection method.

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