If the pressure of a substance is increased during a boiling process, will the temperature also increase, or will it remain constant? Why?

on increasing pressure, temperature will also increase.

Explanation:

Considering the ideal gas equation as:

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Thus, at constant volume and number of moles, Pressure of the gas is directly proportional to the temperature of  the gas.

P ∝ T

Also,  

Also, using Gay-Lussac's law,

Thus, on increasing pressure, temperature will also increase.