Define the following terms:

1. Element symbol.
2. Atomic Number.
3. Atomic Mass.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.