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7. What happens to the particles of gas as you inflated the balloon?
A. The particles of gas spread at the center of the balloon.
B. The particles of gas spread and closed each other.
C. The particles keep on coming in and out of the balloon.
D. The particles of gas spread in every corner of the balloon.​

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Answer:

The Answer is Letter D.

Explanation:

The pressure inside the hot air balloon is affected by temperature. As the molecules heat up, they move faster and strike the inside wall of the balloon harder. This increased motion of the gas particles increases the force on an area of the balloon, producing a rise in the pressure.

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