Armand explained to his friend Bertrand that, in general, if you have a gas container and the amount of gas is doubled, the new pressure will be double the old pressure. The term "general" is employed because this is not exactly accurate, but it is close enough for the purposes of answering his next query.

Armand now posited this question to Bertrand, "If you have a tire filled with the standard 32 psi and you double the amount of air molecules in the tire, what pressure will your tire gauge now read? Assume that the tire does NOT expand, and that the first paragraph containing my initial information is exactly true."

Bertrand immediately answered, "64 psi."
But, Armand replied back to him, "Your answer is incorrect!"

What is the correct answer and why?