Document page
igcse physics notesprinted 80 · PDF 80
124 pagesrevision 46936
printed 80 · PDF 80
Page image rendered from the stored file at 110 dpi; it sharpens as you zoom. Outlines are placed from each region’s stored position on the page (612 × 792 pt).
readable
Source of this text: embedded text layer. The better of the embedded text and OCR is kept.
80
UNIT 2.2 -2.3 Thermal Physics
Conduction: Process in which heat energy transfers without the movement
of medium. For example in copper and Aluminium etc.
Conductor: Material that contains free moving electrons. For example
copper and other metals.
Insulator: Material that does not contain any free moving electrons. For
example rubber, plastic, and glass.
As shown in the above image, when heat is provided to one part of a solid,
then the particles in it start to collide vigorously with each other. This is the
process by which heat reaches from hot molecule to cold molecule as they
transfer energy to cold particles. Gradually all of the solid gets heated thus
we can conclude that heat moves from high temperature region to low
temperature region.