Concept Development

Practice Page

20-1

Gases

1. A principle difference between a liquid and a gas is that when a liquid is under pressure, its

volume

(increases) (decreases) (doesn't change noticeably)

PHYSICS

and its density

SIGHS

(increases) (decreases) (doesn't change noticeably)

When a gas is under pressure, its volume

(increases) (decreases) (doesn't change noticeably)

and its density

(increases) (decreases) (doesn't change noticeably)

1

2. The sketch shows the launching of a weather balloon

at sea level. Make a sketch of the same weather balloon 1

when it is high in the atmosphere. In words, what is

different about its size and why?

1

1

The main difference between a liquid and a gas is that when a liquid is under pressure, its volume "won't change apparently. The reason is that the distance between the molecules of a liquid is relatively small, and the molecules of a liquid extensively withstand the compressive forces. This is similar to the distance between the molecules of a solid."

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