Why does a gas from a small container when transferred to a larger container occupy all the space available?

Why does a gas from a small container when transferred to a larger con

1.	Why does a gas from a small container when transferred to a larger container occupy all the space available?
A.	Gas has no definite mass.
B.	Gas has no definite shape.
C.	Gas has no definite volume.
D.	Gas has no definite density.
Answer» D. Gas has no definite density.

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Why does a gas from a small container when transferred to a larger container occupy all the space available?

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