Background: Many people enjoy riding in hot air balloons. Some use them for romantic picnics and marriage proposals. Others race in competitions. Being above the earth gives a whole new perspective on the world around us. As the beginning of a hot air balloon ride, the balloon is flat because the pressure inside the balloon equals the pressure outside. When the air inside the balloon is heated, the speed of movement of those air molecules increases and the pressure goes up. After a while the balloon is completely expanded and the flight is ready to take off.

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Which balloon would have higher inside pressure, balloon A or balloon B?
Answer: balloon B

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Which balloon would have lower inside pressure, balloon A or balloon B?
Answer: balloon A

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Would balloon A have higher or lower inside pressure than balloon B?
Answer: lower

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Would balloon B have higher or lower inside pressure than balloon A?
Answer: higher

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Which balloon would have faster inside air movement, balloon A or balloon B?
Answer: balloon B

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Which balloon would have slower inside air movement, balloon A or balloon B?
Answer: balloon A

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Would balloon A have faster or slower inside air movement than balloon B?
Answer: slower

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Would balloon B have faster or slower inside air movement than balloon A?
Answer: faster

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Which balloon is more likely to take off, balloon A or balloon B?
Answer: balloon B

Situation: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly.

Question: Which balloon is less likely to take off, balloon A or balloon B?
Answer: balloon A