Heat transfer continued Flashcards
(17 cards)
What is your average body temperature
36-37.5 degrees
How does heat rise
heat expands and becomes less dense
what colour absorbs heat the best
Black and matte black
what colour emits heat the best
Black and matte black
what colour absorbs heat the worst
white and shiny
what colour emits heat the worst
white and shiny
What is heat
Heat is a type of energy that will flowed from a warmer area to a cooler one. Ir is the total amount of energy in the particles of a substance
How does something cool down
Heat energy is transferred into the surroundings
how does something heat up
something takes heat energy from its surroundings
What is temperature
Temperature is a measure of how hot or cold an object is
Are solids good conductors
most of them
are liquids good conductors
no
are gases good conductors
no
how is a convection current set up
- Something heats up the water
- The warm water expands and becomes less dense
- The less dense water rises
- Cooler, more dense water sinks to replace the warm water
- a convection current is set up
what is room temperature
23-25 degrees
On a hot summer day, how does placing a shiny reflective item on the windscreen help
a shiny reflective item are the worst emitters of heat so when the heat goes onto the shiny reflective item it reflects right off, making the inside of the car nice and cool
how does placing a reflective sheet behind a wall radiator help
A lot of heat energy from radiators is wasted through the walls, so placing something reflective behind it reduces the wasted heat by reflecting it back into the room
