By inserting a constant, a statement of proportionality can be turned into an equation. For example, the diameter of a circle is proportional to its radius, ∝ . Insertion of the constant of proportionality 2, allows one to express this relationship as an equation, = 2. For gases, the constant of proportionality is , Boltzmann’s constant. Use this constant to express the relationship you derived in Step 1 as an equation instead of a proportionality. From a text or web resource, find the most common expression of this equation, which is called the Ideal Gas Law.