Page 36 - Finalll Science BB Prep2 t1 2025_Neat

Thermal conductivity: A measure for the extent to

which a substance can conduct heat through.

There is difference in time of falling of pins in each rod depending on its

thermal conductivity.

Order of natural elements according to their thermal conductivity
They can’t

Diamond ˃ Ag (silver) ˃ Cu ˃ Fe prevent
transfer of heat

P.O.C Thermal conductors Thermal insulators
Definition Materials let heat flow Materials
through freely. slow down the heat transfer

Good heat conducting Poor heat conducting
Ex: Diamond & Metals: Wood, glass, plastic, paper, wool,

Iron, aluminum, copper, rubber and air.
mercury. Cardboard box of pizza
Usage “Ironing” Handles of cooking pots.
Cooking utensils Polystyrene panels + air

Cooling system in bet. hollow clay bricks
electronic devices to get rid “20 times less in its thermal
of excessive heat conductivity”to prevent

rapid change in
temperature & reduces the
cost of air conditioning

First Term 63