Physical & Chemical Changes

In this video podcast I demonstrate the difference between physical changes and chemical changes. A physical change does not alter the matter (steam and ice are still both water and can both turn back into liquid water) but a chemical change actually alters the matter (for example water can cause iron to rust, and this is not reversible). Stand back and watch these action-packed physical and chemical changes to a Lego house... and as usual, don't try this at home. The video is here and the soundtrack can be found on