Mass Accounting

A review of what it means for a quantity to be conserved, using the law of conservation of mass as an example. Tries to distinguish between a quantify being "constant" vs. "conserved." (A quantity may not be constant (like oranges in a bag) but may still be conserved (total number of oranges in the bag and among friends). Based on an ISLE sequence by E. Etkina. Uses a video from Nigel Baldwin: http://www.youtube.com/watch?v=TsnLmgWXw-E

By Frank Noschese