Final answer:
Avogadro's Law explains that adding air to a flat tire increases pressure by increasing the number of gas molecules inside, and it is essential to maintain the tire pressure within recommended levels to ensure safety and performance.
Step-by-step explanation:
A flat tire can greatly affect the performance and safety of a vehicle. According to Avogadro's Law, when air is added to the tire, increasing the number of gas molecules within the fixed volume of the tire, the pressure inside the tire increases. It is critical to maintain the proper pressure as recommended for the tire, which can be found on the tire's pressure rating. Having too little pressure results in a tire that cannot maintain its shape, compromising its intended function, while an overinflated tire poses the risk of bursting.