Characteristic Length in Heat Transfer | Forced, Free Convection | Lumped Heat Transfer 

nicely explained man, you deserved to be a professional teacher.

before this video ...i had watched a lot videos on characteristic length .....and i can say this is the most perfect explanation....thank you so much sir

Thank you, searching for this everywhere

Thank you so much! Very helpful!

Many thanks.! Finally I got a good one.

sir characterstics length in HT in case of cube will be?