Chapter 6 Recital Dictation 2 Flashcards
1
Q
1.1
A
When the air is removed from the hemisphere,
2
Q
1.2
A
There are fewer air particles inside to hit the walls of the hemisphere and the air pressure inside decreases.
3
Q
1.3
A
Thus, the air pressure outside is higher than that inside.
4
Q
1.4
A
As a result, it is hard to pull the hemispheres apart.
5
Q
2.1
A
When the air inside a hot air balloon is heated, the air particles move faster and become further apart.
6
Q
2.2
A
The air expands so its density decreases.
7
Q
2.3
A
The overall density of the balloon becomes lower than the density of the air around it and thus the balloon rises.
