Question

If the pressure is constant, it simplifies to _____________ law.

Answer 1

the question is not absolutely clear, as you have not mentioned the entire statement...

but, still the part which you have written, corresponds to Charle's law...

hope it helps

Answer 2

Charle's Law

Step-by-step explanation:

Charles's law—named for J. -A. -C. Charles (1746–1823) is a statement that the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the pressure remains constant.