Question

An alternate way to state Avogadro’s law is “All other things being equal, the number of molecules in a gas is directly proportional to the volume of the gas.” (a) What is the meaning of the term “directly proportional?” (b) What are the “other things” that must be equal?

Short answer

(a) "Directly proportional" suggests that if one value increases, the other increases as well.

(b) The temperature and pressure must both be the same.

Step-by-step solution

Definition of Boyle’s law

Avogadro's law, also known as Avogadro-hypothesis, Ampère's is a gas law that relates the volume of a gas to the amount of gas material present.

Explaining the term directly proportional

(a)

The word "directly proportional" refers to the fact that when one number rises, the other rises with it. Avogadro's law states that as the number of gas molecules increases, so does the volume of the gas (and vice versa).

Explaining what are the “other things” that must be equal

(b)

The temperature and pressure are the "other things" that must be equal for Avogadro's law to be valid.