What physical effect can change the boiling point of a substance?

Pressure can affect the boiling pressure of a substance

as when pressure increases the particles are closer together and so require more energy to boil therefore increasing the substances boiling point 

hope that helps

The boiling point of a substance is dependent to the pressure. The pressure and saturated temperature are often presented in tables and sometimes in graphs. In addition, the amount of solute in the solution can also change the boiling point of the solvent. 

Because it was a dramatically big guy