Infra-Red Radiation
Infra-Red Radiation is part of the Electromagnetic spectrum. It is an Electromagnetic Wave. Conduction and convection need particles to transfer energy but Infra-Red Radiation can travel through a vacuum: it's how we get heat from the sun!
Everything gives off, or emits, some infra-red radiation. The hotter you are, the more you give off. We can use IR sensors in thermal imaging cameras to see how hot things are or to see in the dark.
Black objects are good emitters and absorbers of IR radiation and silver objects are good reflectors.
You have to think about whether you want something to keep warm or cool when you decide on what colour you make an object. For example, what colour clothes should you wear in the summer? Well, if you're staying in the shade, you want to wear dark colours because they are good emitters of IR and so you'll lose some of your body heat but if you're out in the sunshine, a black T-shirt would absorb the IR from the sun and you'd get to hot: you want a nice white outfit that will reflect the sun's IR.
Everything gives off, or emits, some infra-red radiation. The hotter you are, the more you give off. We can use IR sensors in thermal imaging cameras to see how hot things are or to see in the dark.
Black objects are good emitters and absorbers of IR radiation and silver objects are good reflectors.
You have to think about whether you want something to keep warm or cool when you decide on what colour you make an object. For example, what colour clothes should you wear in the summer? Well, if you're staying in the shade, you want to wear dark colours because they are good emitters of IR and so you'll lose some of your body heat but if you're out in the sunshine, a black T-shirt would absorb the IR from the sun and you'd get to hot: you want a nice white outfit that will reflect the sun's IR.