Thermal Physics Section 4

considered to be (¾)@.."+

e,i,4-Ł1 ■ All substances emit radiant energy in Ł-v'Ł ;il-V/Jc,..Ł-eŁ Ł

■ To calculate the rate of heat transfer Ły radiation

■ Q/at= e. 9-' A-TL-/ ■ e -emissivity of a surface, from O to 1 ■ a -Stefan-Boltzmann constant-5.67x10"(W/m2)K' ■ T -temperature in kelvin

Conduction

Transfer of energy within materials and between materials that are in contact with each other

Insulators

do not transfer energy well

Conductors

Transfer electricity and heat well

convection

the vertical movement of heat or other properties by massive motion within the atmosphere

radiation

the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

heat is...

infrared