According to the kinetic molecular theory, what is the primary cause of gas pressure inside a balloon?

• A. Gas molecules colliding with the inner walls of the balloon
• B. The weight of the gas molecules pressing down on the balloon
• C. The expansion of the balloon due to increasing temperature
• D. Gas molecules attracting each other inside the balloon

Answer: (A)

Verified step by step guidance

1. Recall the kinetic molecular theory, which explains the behavior of gas particles in terms of their motion and interactions.
2. Understand that gas pressure is caused by the force exerted when gas molecules collide with the surfaces they encounter.
3. Recognize that inside a balloon, gas molecules are constantly moving and striking the inner walls, creating pressure.
4. Eliminate options that do not directly cause pressure: the weight of gas molecules is negligible, expansion is a result of pressure and temperature changes, and gas molecules do not attract each other significantly in ideal gases.
5. Conclude that the primary cause of gas pressure inside a balloon is the collisions of gas molecules with the inner walls of the balloon.