Introduction
In order to determine whether a flat tire or an inflated tire is heavier, it is important to understand the factors that contribute to the weight of each.

Factors that contribute to the weight of a tire
1. Tire Material: The type of material used in the construction of the tire can significantly affect its weight. Tires are typically made of rubber, steel belts, and various other components.

2. Tire Size: The size of the tire, including the width and diameter, can also influence its weight. Larger tires tend to be heavier due to the increased amount of material used in their construction.

3. Air Pressure: The amount of air pressure inside the tire affects its weight. An inflated tire contains pressurized air, which adds to its overall weight.

Weight of a flat tire
When a tire is flat, it means that it has lost its air pressure and has become deflated. In this state, the tire no longer contains pressurized air, resulting in a decrease in weight compared to an inflated tire.

Weight of an inflated tire
An inflated tire contains pressurized air, which adds to its overall weight. The air pressure inside the tire creates a force that contributes to the weight of the tire. Therefore, an inflated tire is generally heavier than a flat tire.

Conclusion
In conclusion, an inflated tire is heavier than a flat tire. The air pressure inside an inflated tire adds to its overall weight. On the other hand, a flat tire has lost its air pressure and is lighter as a result. The weight of a tire is influenced by various factors such as tire material and size, but the presence or absence of air pressure is the primary determinant in this case.