What is the formula for the perfect gas law?

The perfect gas law is represented by the formula PV = nRT, where P is pressure, V is volume, n is the number of moles of the gas, R is the universal gas constant, and T is the absolute temperature in Kelvin. This equation shows the relationship among these variables for an ideal gas, providing a foundational principle in thermodynamics.

In this context, A (PV = MRT) is not the correct representation of the ideal gas law; instead, it resembles a form used in specific conditions or different contexts. Understanding the standard equation is crucial since it applies to a wide range of gases under varied conditions, enabling predictions about gas behavior and calculations in practical applications such as refrigeration.

The incorrect choices highlight misunderstandings of the relationships between gas variables. Option C (P = V/T) simplifies the relationships inaccurately, and D (P + V = 1) has no basis in gas law principles. These distinctions clarify the importance of the correct formula in understanding gas behavior in refrigeration and other applications.