Gases

[Temperature101]

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A gas differs from liquid in all the following ways EXCEPT:


A. a liquid has a definite volume while a gas does not.

B. particles in a liquid are always in contact with one another, while particles in gases are NEVER in contact with one another

C. a gas is more compressible that a liquid.

D. an object is more buoyant in a gas than liquid.

I know the answer is D. But why they said paticles in gases are NEVER in contact with one another? How about when they collide.

 

[milski]

Never would be incorrect, it would mean that no chemical reactions can happen between gasses. It is a bit of hyperbola but they do spend a lot more time not hitting each other. Is the bolding/upper case yours or is it that way in the question?

 

[Temperature101]

Never would be incorrect, it would mean that no chemical reactions can happen between gasses. It is a bit of hyperbola but they do spend a lot more time not hitting each other. Is the bolding/upper case yours or is it that way in the question?

The bolding upper case is mine...Wanted to highlight the word never.

 

[milski]

The bolding upper case is mine...Wanted to highlight the word never.

I think they just overemphasized how rarely the gas molecules hit each other. The option of a gas with higher density than a liquid seems a lot less reasonable.