Not a so dumb question.
The boiling/saturation curve is P vs T. So you can't define a boiling point temperature without the associated pressure.
If the boiling point of pure ethylene is 104 degC at atm pressure, then it will change state (liquid to vapor) at that temperature at the atm pressure.
"We don't believe things because they are true, things are true because we believe them."
hey thanks for the info...I am study for an MSc in Process Safety, and I come from an electrical background, so its somewhat of a sharp learning curve.. that's helpful, thanks