A dull black surface will radiate and absorb heat better than a bright shiny surface.
Four containers were filled with warm water. Which container would have the warmest water after ten minutes?
The container would be the warmest after ten minutes because its shiny surface reflects heat _ back into the container so less is lost. The container would be the coolest because it is the best at _ heat radiation.
Radiation travels in straight lines
Radiation can travel through a vacuum
Radiation requires particles to travel
Radiation travels at the speed of light
Why are houses painted white in hot countries?
White reflects heat radiation and keeps the house cooler.
Why are shiny foil blankets wrapped around marathon runners at the end of a race?
The shiny metal reflects the heat radiation from the runner back in, this stops the runner getting cold.
Transfer of heat is through a SOLID by being passed from one particle to the next
Particles at the warm end move faster and this then causes the next particles to move faster and so on. e.g: poker in fire
spoon in tea
In this way heat in an object travels from: the HOT end the cold end
When you heat a metal strip at one end, the heat travels to the other end.
As you heat the metal, the particles vibrate, these vibrations make the adjacent particles vibrate, and so on and so on, the vibrations are passed along the metal and so is the heat. We call this? Conduction
If a substance easily allows heat to move through it, we can say it is a good conductor of heat. e.g: most metals
If a substance does not allow heat to pass through it easily we can say it is an Insulator. E.g: wood, plastic, glass
Why do many sauce pans have plastic handles?
Conduction V Insulation