hi, yes yes so this is my physics notes and first aid blog. which hopefully by the end f the holidays would cover most of the topics needed and all the importatnt notes and exercises needed for revision.
the notes are still being updated. the late updates are due to house under renovation and being ill for a long time so please excuse the lack of posts T_T they'll be all up veryvery very soon...
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applications of convection
application of convection~
1. electric kettle
the heater is placed at the bottom of the kettle so that as the hot water rises, cold water form the top moves down. in this way, heat is transferred to all parts of the liquid.
2. refrigerator
the cooler box is found usually on the top. this is to constantly cool thehot air which rises and to
3. sea and land breeze
during the day, the land gets heated up faster than the sea, the hot air above the land rises and is replaced by the cooler air from the sea. a sea breeze is thus poduced.
At night the land cools faster than the sea therefore the sea is warner the warm air above the sea rises and cool air form the land move toawrds the sea. hence a land breeze is produced.
~gliding
because of the land and sea breeze, hang gliders and birds like seagulls can stay aiborne
4. heaters
the heaters are usually placed on the floor at one corner
this is so that they can warm up the cool dense air at the bottom constantly
ventilation.
cold fresh air enters a house through open doors, windows and airholes at the bottom of the windows, the air in the house is warmed up by heat from the human bodies, lighted bulbs and fire in the kitchen.
warm air rises and escapes through the air holes at the top
posted by supermassive on Tuesday, June 23, 2009
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