Dimensional Analysis is a way to
simplify complex calculations. This
method is
relatively easy to
learn and master, and
may seem like a waste of time to the advanced math and/or
science brain. I've found it
very useful. Especially for
Chemistry,
Physics or
Electronics classes.
In short, Dimensional Analysis is a way of arranging
values and their
respective units in fractions or ratios. When two units are exactly alike and diagonaly oriented, they are 'crossed out' or
eliminated. If, after all the
crossing out you end up with the unit(s) desired, then you can simply multiply across and then divide.
Here is a small demonstration (ASCII for your pleasure) of Dimensional Analysis on a
Stoichiometric problem:
N2 + 3H2 => 2NH3
4.3gN2 1mol 3 mol H2 2.02g 0.93g of H2
?g of H2= ------- x -------- x -------- x ----- = ----------- 1 28.02g 1 molN2 1 mol 1
Thanks to Storm Damage and vivid for pointing out the pre tags! D'oh!