急要Heat convection applications!!!!!!!!

heat convection in AIR

- air conditioning
- radiators/ heaters
- refrigerators
- cooking: steaming dim sum/ fish/ food, melting chocolate

heat convection in LIQUID/FLUID
- thorough mixing of liquid e.g in molten metal during casting

one application of convention of heat is that
air conditioner is put in a higher position .
it is because cool wind is denser than hot air.
it will move downwards.
the hot air then rise .
the hot air will now become cool .
so the convection process continues until the temperature is
the same everywhere in the room.