Unit 11.Thermal energy transfer

04.27.2020
09:08:58
Dear students, good morning
Today's topic in physics : convection
Pg.no : 152 to 154
The important points are
1.The rising of hot air is one example of convection
2.Hot air can rise because air is a fluid,and convection can happen only in fluids like liquid or gas.
Look at figure 11.7
3. Difference between convection and conduction
* A convention current is a movement of a fluid that carries Energy from a warmer place to cooler one.
* In convention , Energy is transferred through a material from a warmer place to cooler place by the movement of material itself.
* In conduction , Energy is transferred through a material from a warmer place to cooler place without the material itself moving
Look at figure 11.8
4.for examples fridge where convection concept is applied.
Figure : 11.10
For better understanding of concepts watch the below videos